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Yn y mynegeion y mae'r termau sy'n perthyn i ddisgrifiadau byw wedi'u tanlinellu.
A|B|C|D|E|F|G|H|I|J|K|L|M|N|O|P|Q|R|S|T|U|V|W|X|Y|Z|Eraill/Other
Y Babell (Church : Cwmbwrla, Wales) USE Babell (Church : Cwmbwrla, Wales) (Active 1853-1987 | Cwmbwrla ; Swansea | Calvinistic Methodist/Presbyterian church)
Y Blaid Genedlaethol. | Cangen Canoldir Lloegr USE Plaid Cymru | Cangen Canoldir Lloegr (Birmingham | political party branch)
Y Bont-faen (Wales : Borough) USE Cowbridge (Wales : Borough) (Cowbridge (Wales) | local government)
Y Bontfaen (Wales : Borough) USE Cowbridge (Wales : Borough) (Cowbridge (Wales) | local government)
Y Casglwr USE Casglwr (1977-)
Y Clorianydd USE Clorianydd (1871-1965 | Anglesey (Wales); Gwynedd (Wales))
Y Cofiadur : sef cylchgrawn Cymdeithas Hanes Annibynwyr Cymru USE Cofiadur (founded 1923 | periodical)
Y Cyfnod (est. 1934 | Bala (Wales) | newspaper)
Y Cymric USE Cymric (Society) (Formed [late 19th century] | Bangor (Wales) | society)
Y Cymro (Established 1932 | Wales | Weekly newspaper)
Y Dinesydd Cymreig (1912-1929 | weekly newpaper of Labour Party in North Wales)
Y Dolydd (old people's home) USE Meadows (Old people's home : Llanfyllin, Wales) (closed 1982 | Llanfyllin (Wales) | old people's home)
Y Drysorfa USE Drysorfa (1831-1968 | Chester (England); Wales | religious periodical)
Y Dydd a'r Corwen Cronicl USE Y Dydd (est. 1868 | Dolgellau (Wales) | newspaper)
Y Dydd (est. 1868 | Dolgellau (Wales) | newspaper)
Y Faner (discontinued 1992 | Wales | newspaper, magazine)
Y Fenni Manor (Wales) USE Abergavenny Manor and Lordship (Wales) (Abergavenny | manor)
Y Gelli estate (Llanfair Caereinion, Wales) USE Gelli Estate (Llanfair Caereinion, Wales) (Llanfair Caereinion (Wales))
Y Goppa (Church : Pontarddulais, Wales) USE Goppa (Church : Pontarddulais, Wales) (est. 1773 | Pontarddulais (Wales) | Calvinistic Methodist church)
Y Graig Calvinistic Methodist church (Penrhosgarnedd, Wales) USE Y Graig chapel | (Penrhosgarnedd, Wales) (Penrhosgarnedd (Wales) | Calvinistic Methodist church)
Y Graig chapel | (Penrhosgarnedd, Wales) (Penrhosgarnedd (Wales) | Calvinistic Methodist church)
Y Llenor USE Llenor (1922-1955 | literary magazine)
Y Lloffwr USE Lloffwr (established 1978 | Carmarthenshire (Wales) | publication)
Y Llyfrfa Fethodistaidd (Bangor, Wales) USE Llyfrfa Wesleyaidd (Bangor, Wales) (Bangor (Wales) | Publishing)
Y Llyfrfa Wesleyaidd (Bangor, Wales) USE Llyfrfa Wesleyaidd (Bangor, Wales) (Bangor (Wales) | Publishing)
Y Lolfa (Firm) USE Lolfa (Firm) (Tal-y-bont (Ceredigion, Wales) | publishers)
Y Pil (Wales) |1 USE Pyle (Wales) (Pyle (Wales) | parish administration)
Y Rhath (Cardiff, Wales) |1 USE Roath (Cardiff, Wales) (Roath (Cardiff, Wales) | parish administration)
Y Rhedegydd USE Rhedegydd ([active 1887-1951] | Blaenau Ffestiniog (Wales) | newspaper)
Y Rhigos (Wales) |1 USE Rhigos (Wales) (Rhigos (Wales) | local government)
Y Seren (Bala, Wales) USE Seren (Bala, Wales) (active 1895-1962 | Bala (Wales) | periodical)
Y Seren Printing Works (Bala, Wales) USE Seren Printing Press (Bala, Wales) (active 1885-1895 | Bala (Wales) | printing)
Y Sosban USE Sosban (1975-1977 | Llanelli | Local newspaper)
Y Tabernacl, Pontardawe USE Tabernacl Welsh Independent Church (Pontardawe, Wales) (Active 1878-1999 | Pontardawe (Wales) | Independent Church)
Y Traethodydd (founded 1845 | Denbigh (Wales); Holywell (Wales); Caernarfon (Wales) | periodical)
Y Wern (Church : Wrexham, Wales) USE Wern Congregational Chapel (Wrexham, Wales) ([1808]-[1955] | Wrexham (Wales) | Congregational church)
Y. F. C. Wales (Society). Welsh Heritage Project USE Cymdeithas Ffermwyr Ifainc (Society) | Welsh Heritage Project ()
Yale & Hardcastle USE Yale and Hardcastle (active [19th century]-[1979] | Caernarfon (Wales) | chartered surveyors)
Yale and Hardcastle (active [19th century]-[1979] | Caernarfon (Wales) | chartered surveyors)
Yale Motor Company (Denbighshire | Motor company | Company)
YDCW USE Campaign for the Protection of Rural Wales (renamed 1991 | Wales | environmental protection)
Yelverton Estate (Wales) (Pembrokeshire | Family estate)
Yendall and Company USE Yendall & Co Ltd (1870-1984 | Risca (Wales) | printing; typefounding | family limited company from 1911)
Yes for Wales (Organization) (1997-1998 | political campaigning)
YFC Wales (Society) USE Wales YFC (Federation) ()
YMCA | Rhydypennau branch (Active 1928-1968 | Bow Street (Wales) | Social club)
Ymddiriedolaeth Cerdd Ynys (Charity) (active [1979]-[1991] | Anglesey (Wales) | music charity)
Ymddiriedolaeth Cronfa Goffa Saunders Lewis USE Cronfa Goffa Saunders Lewis ()
Ymddiriedolaeth Genedlaethol (Great Britain) USE National Trust (Great Britain) (Active 1966-1984 | Flintshire (Wales))
Ymddiriedolaeth Harbwr Caernarfon USE Caernarfon Harbour Trust (est. 1793 | Caernarfon (Wales) | trust)
Ymddiriedoleath Amgueddfa Rheilffyrdd Bach Cul USE Narrow Gauge Railway Museum Trust (Tywyn (Gwynedd, Wales) | Registered charity; registered museum.)
Ymgyrch Cymru dros y Cynulliad (1979 : Political campaign) USE Wales for the Assembly Campaign (1978-1979 | Wales | political campaigning)
Ymgyrch Diogelu Cymru Wledig USE Campaign for the Protection of Rural Wales (renamed 1991 | Wales | environmental protection)
Ymgyrch dros Ddiarfogi Niwclear Cymru (Organization) USE CND Cymru (Organization) (1981- | Wales | campaigning group)
Ymgyrch Gefnogi Nicaragua Cymru USE Wales Nicaragua Solidarity Campaign ()
Ymgyrch Senedd i Gymru USE Parliament for Wales Campaign (Wales | political campaign)
Ymgyrch Ysgol Gynradd Gymraeg Penmaenmawr (1964-1980s | Penmaenmawr | School campaign group)
Ynisamman Colliery (Glamorgan | Coal mining)
Ynisarwed Resolven Colliery Company (Active c. 1873-c.1947 | Resolven | Coal mining | Company)
Yniscedwyn Colliery Sick Fund USE Yniscedwyn Sick Fund ()
Yniscedwyn Lodge, National Union of Mineworkers USE National Union of Mineworkers | South Wales Area. | Yniscedwyn Lodge (Ynys-Cedwyn (Wales); Ystradgynlais (Wales) | trades union branch)
Ynyr Amman Colliery USE Nantgwinne Minerals and Ynyr Amman Colliery (Brynamman (Wales) | coal mining)
Ynys Môn (Wales) | Borough Council (1974-1996 | Anglesey (Wales) | local government)
Ynys y Graean Estate (Wales) (active [1642]-[1769] | Llangelynnin (Gwynedd, Wales) | family estate)
Ynys-pen-llwch Estate (Wales) USE Ynyspenllwch Estate (Wales) (Llangyfelach; Trebanos; Clydach | Family estate)
Ynysawdre (Wales) | Parish Council (1894-1974 | Ynysawdre (Wales) | local government)
Ynysawdre Parish Council USE Ynysawdre (Wales) | Parish Council (1894-1974 | Ynysawdre (Wales) | local government)
Ynyscedwyn Iron, Steel & Coal Company (1870-1876 | Ystradgynlais | Ironworks | Company)
Ynyscedwyn Iron, Steel and Coal Company USE Ynyscedwyn Iron, Steel & Coal Company (1870-1876 | Ystradgynlais | Ironworks | Company)
Ynyscedwyn Lodge, National Union of Mineworkers USE National Union of Mineworkers | South Wales Area. | Yniscedwyn Lodge (Ynys-Cedwyn (Wales); Ystradgynlais (Wales) | trades union branch)
Ynyscedwyn Tinplate Works (Ystradgynlais; Swansea Valley | Tin plate manufacture)
Ynyscynhaearn Urban District Council USE Ynyscynhaearn (Wales) | Urban District Council (1894-1920 | Ynyscynhaearn (Wales) | local government)
Ynysddu (Wales). | School Board |1 USE Ynysddu School Board (Active 1877-1881 | Ynysddy (Wales) | educational administration)
Ynysddu School Board (Active 1877-1881 | Ynysddy (Wales) | educational administration)
Ynysfach (Church : Rhondda, Wales) USE Nebo Welsh Baptist Church (Ystrad Rhondda, Wales) (1794- | Rhondda (Wales) | Baptist church)
Ynysfach Primary School (Renamed 1949 | Resolven | Primary school)
Ynysfach Secondary School (Resolven, Wales) (Renamed 1968. | Resolven | Secondary school)
Ynysgain Estate (Wales) (Cricieth | Family estate)
Ynysmaerdy County Primary (Briton Ferry, Wales)) USE Ynysmaerdy Primary School (Briton Ferry, Wales) (Renamed 1952 | Briton Ferry | Primary school)
Ynysmaerdy Primary School (Briton Ferry, Wales) (Renamed 1952 | Briton Ferry | Primary school)
Ynyspenllwch Estate (Wales) (Llangyfelach; Trebanos; Clydach | Family estate)
Ynystawe School (active [1919] | Ynystawe (Wales) | primary school)
Ynyswen Methodist Church (Treherbert, Wales) (Treherbert | Wesleyan Methodist Church)
Ynysybwl Co-operative Society ()
Ynysymaengwyn Estate (Wales) (Tywyn (Merioneth); Montgomeryshire | Family estate)
York Place (Church : Swansea, Wales) USE York Place English Baptist Church (Swansea, Wales) (established 1830 | Swansea (Wales) | Baptist church)
York Place School (Swansea, Wales) (Relocated and renamed 1914 | Swansea | Primary school)
Yorkshire Imperial Metals USE Yorkshire Imperial Metals Ltd ()
Yorkshire Imperial Metals Limited USE Yorkshire Imperial Metals Ltd ()
Yorkshire Imperial Metals Ltd ()
Young Citizen's Association | Cardiff branch (YCA founded 1932 | Cardiff | Welfare and education)
Young Farmer's Clubs USE Wales YFC (Federation) ()
Young Men's Christian Association | Rhydypennau branch |1 USE YMCA | Rhydypennau branch (Active 1928-1968 | Bow Street (Wales) | Social club)
Young Wales (Society) USE Cymru Fydd (founded 1886 | Wales | political movement)
Youth Hostel Association (England and Wales) USE Youth Hostels Association (England and Wales) (Established 1930 | England; Wales | Youth hostel association | Registered charity)
Yr Academi Gymreig USE Academi Gymreig (Founded 1959 | promotion of literature | society)
Yr Angor (Glannau Mersi a Manceinion) USE Angor (Glannau Mersi a Manceinion) (established 1979 | Liverpool (England); Manchester (England) | Welsh language community newspaper)
Yr Haul USE Haul (est. 1835 | Carmarthen (Wales) | periodical)
Yr Ysgub (Established 1980 | Oswestry; Powys; Denbighshire | Community newspaper)
Ysbyty Coffa Madoc (Hospital) USE Madoc Memorial Hospital (opened [c.1920] | Porthmadog (Wales) | healthcare)
Ysbyty Estate (Wales) (active 1903-1950 | Ysbyty Ifan (Wales) | family estate)
Ysbyty Llandochau USE Llandough Hospital (opened 1933 | Llandough (Wales) | healthcare)
Ysbyty Môn ac Arfon USE Caernarfon and Anglesey Infirmary (1845-1984 | Bangor (Wales) | hospital)
Ysceifiog (Wales) USE Ysgeifiog (Wales) ()
Ysgol Aberconwy (School) (active [1926]-[1982] | Conwy (Wales) | school)
Ysgol Babanod Llanfairfechan school(Gwynedd) USE Llanfairfechan National School (Llanfairfechan, Wales) ()
Ysgol Bro Ddyfi (Machynlleth | Secondary school)
Ysgol Brynrefail (founded 1900 | Llanrug (Wales) | school)
Ysgol Cymraeg Cwm Nedd USE Ysgol Gymraeg Cwmnedd (Neath, Wales) (opened 1954 | Glyn-neath (Wales) | primary school)
Ysgol Dr Williams (Dolgellau, Wales) USE Dr Williams' School (Dolgellau, Wales) (1875-1975 | Dolgellau (Wales) | girls' boarding school)
Ysgol Friars, Bangor USE Friars' School (Bangor, Wales) (active [post 1536]-1968 | Bangor (Wales) | school)
Ysgol Ger y Llan Voluntary Controlled School USE Letterston V C Primary School (1852-2004 | Letterston (Wales) | school)
Ysgol Gwfaint (Holyhead, Wales) USE Le Bon Sauveur Convent School (Holyhead (Wales) | school)
Ysgol Gyfun Penweddig (established 1973 | Aberystwyth (Wales) | school)
Ysgol Gymraeg Cwmnedd (Neath, Wales) (opened 1954 | Glyn-neath (Wales) | primary school)
Ysgol Gynradd Brongest (active 1898-1987 | Brongest (Wales) | education)
Ysgol Gynradd Cilcennin USE Cilcennin School (Lampeter (Wales) | school)
Ysgol Gynradd Gymraeg Cwm Nedd USE Ysgol Gymraeg Cwmnedd (Neath, Wales) (opened 1954 | Glyn-neath (Wales) | primary school)
Ysgol Gynradd Gymraeg Garnswllt (Ammanford, Wales) (1873-2006 | Garnswllt (Wales) | school)
Ysgol Gynradd Pontybrenin USE Pontybrenin Primary School (Swansea, Wales) (opened 1908 | Gorseinon (Wales) | school)
Ysgol Gynradd Sirol Tairgwaith USE Tairgwaith Primary School (Rhydaman, Wales) (opened 1900 | Tairgwaith (Wales) | primary school)
Ysgol Gynradd Trebannws USE Trebanos School (opened 1884 | Trebanos (Wales) | primary school)
Ysgol John Bright (School) (active [1893]-[2005] | Llandudno (Wales) | school)
Ysgol Myfennydd (Llanrhystud, Wales) (Llanrhystud | School)
Ysgol Pencae (Caernarfonshire) USE Penmaenmawr (Dwygyfylchi) National School (Dwygyfylchi, Wales) (school)
Ysgol San Sior (Llandudno, Wales) USE St George's National School (Llandudno, Wales) (active 1863-1994 | Llandudo (Wales) | education)
Ysgol Sir Bethesda (School : Bethesda, Gwynedd, Wales) USE Bethesda County School (Bethesda, Gwynedd, Wales) (1893- | Bethesda (Gwynedd, Wales) | education)
Ysgol Sir Ffestiniog (active [1898]-[1968] | Blaenau Ffestiniog (Wales) | school)
Ysgol Sir Llanberis USE Llanberis County School (Llanddeiniolen (Wales) | school)
Ysgol Syr Thomas Picton, Hwlffordd, Sir Benfro, SA61 2NX USE Sir Thomas Picton School (Haverfordwest, Wales) ([active 1966-1987] | Haverfordwest (Wales) | school)
Ysgol Tal-y-bont (Ceredigion, Wales) USE Tal-y-bont School (Ceredigion, Wales) (active [late 19th century] | Tal-y-bont (Ceredigion, Wales) | education)
Ysgol Tirdeunaw, Heol Ddu, Tirdeunaw, Abertawe USE Tirdeunaw School (Swansea, Wales) (active [1864]-[1959] | Swansea (Wales) | primary school)
Ysgol Tirmorfa USE Tirmorfa School (Port Talbot, Wales) (active 1956-2005 | Port Talbot (Wales) | primary school)
Ysgol Undodaidd Cribyn (Cribyn, Wales) USE Cribyn Day School (Cribyn, Wales) (Cribyn (Cardiganshire, Wales) | Day school)
Ysgol Uwchradd Llanfyllin USE Llanfyllin High School (active [1912]-[2005] | Llanfyllin (Wales) | secondary school)
Ysgol Uwchradd y Drenewydd USE Newtown High School (Newtown, Wales) (active [1890]-[2005] | Newtown (Powys, Wales) | school)
Ysgol Werin Pant y Beiliau (School) ([active 1932-1940])
Ysgol Wirfoddol Meithrin a Chynradd Hubberston, Hakin, Aberdaugleddau USE Hubberston County Primary School (Hubberston, Wales) ([active 1897-2000] | Hubberston (Wales) | school)
Ysgol y Moelwyn (renamed 1968 | Blaenau Ffestiniog (Wales) | school)
Ysgoldy (Aberystwyth, Wales) (1812-c. 1911 | Aberystwyth | Grammar school)
Ysgoldy Caeadda (Trawsfynydd, Wales) (Trawsfynydd | School)
Ysgubor y coed Community Council USE Ysgubor-y-coed (Wales) | Community Council (created 1974 | Ysgubor-y-coed (Wales) | local government)
Ysgubor y coed Parish Council USE Ysgubor-y-coed (Wales) | Parish Council (1894-1974 | Ysgubor-y-coed (Wales) | local government)
Ysgubor-y-coed (Wales) | Parish Council (1894-1974 | Ysgubor-y-coed (Wales) | local government)
Ystalyfera (Wales) (Ystalyfera (Wales))
Ystrad Estate (Carmarthenshire, Wales) (Carmarthenshire | Family estate)
Ystrad Marchell Abbey (Wales) USE Strata Marcella Abbey (Wales) (1170-1536 | Welshpool (Wales) | religion)
Ystrad Marchell Manor (Wales) ()
Ystrad Meurig School USE Ystrad Meurig Grammar School (Ystradmeurig, Wales) (est. ca. 1734 | Ystradmeurig (Wales) | education)
Ystrad Mynach Estate (Wales) (Caerphilly | Family estate)
Ystrad Mynach Welfare Association ()
Ystrad-fawr Estate (Wales) (Ystradgynlais | Family estate)
Ystradau (Llanelli, Wales: Estate) USE Stradey (Llanelli, Wales: Estate) (Demolished 1855 | Llanelli | Family estate)
Ystradfellte (Wales) (created 1923 | Ystradfellte (Wales))
Ystradgynlais (Wales) | Community Council (Created 1974 | Ystradgynlais | Local government)
Ystradgynlais (Wales) | Parish council (1894-1974 | Ystradgynlais | Local government)
Ystradgynlais (Wales) | Rural District Council (1894-1974 | Ystradgynlais | Local government)
Ystradgynlais (Wales) (Ystradgynlais (Wales))
Ystradgynlais National School (active [1773]-[1816] | Ystradgynlais (Wales) | primary school)
Ystradmeurig Grammar School USE Ystrad Meurig Grammar School (Ystradmeurig, Wales) (est. ca. 1734 | Ystradmeurig (Wales) | education)
Ystradowen (Vale of Glamorgan, Wales) (Ystradowen (Vale of Glamorgan, Wales) | parish)
Ystradwrallt Estate (Wales) (Abergwili (Wales) | family estate)
Ystradyfodwg ( Wales) | Community Council (Created 1974 | Ystradyfodwg | Local government)
Ystradyfodwg (Wales) | Local Board of Health (1877-1895 | Ystradyfodwg | Sanitation and health)
Ystradyfodwg (Wales) | Urban District Council (1894-1897 | Ystradyfodwg | Local government)
Ystradyfodwg (Wales). | Burial Board |1 USE Ystradyfodwg Burial Board (c. 1871-1896 | Ystradyfodwg | Cemetery administration)
Ystradyfodwg (Wales). | Parish Vestry |1 USE Ystradyfodwg (Wales) (Ystradyfodwg | Anglican parish)
Ystradyfodwg (Wales) (Ystradyfodwg | Anglican parish)
Ystradyfodwg Burial Board (c. 1871-1896 | Ystradyfodwg | Cemetery administration)
Ystradyfodwg Local Board of Health USE Ystradyfodwg (Wales) | Local Board of Health (1877-1895 | Ystradyfodwg | Sanitation and health)
Ystradyfodwg Urban District Council USE Ystradyfodwg (Wales) | Urban District Council (1894-1897 | Ystradyfodwg | Local government)
Ystumcolwyn Estate (Wales) (Meifod; Montgomeryshire | Family estate)
Ystumllyn estate (Wales) ([active 1790s-1840s] | Criccieth (Wales) | family estate)
A|B|C|D|E|F|G|H|I|J|K|L|M|N|O|P|Q|R|S|T|U|V|W|X|Y|Z|Eraill/Other
Diweddarwyd y tudalen/Page updated 2009-05-19 at 16:25:29
