Y gwahaniaeth rhwng diwygiadau o "Pen-y-bryn, Abergwyngregyn"

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==Dyddio Pen y Bryn==
Ceir cofnod fod adeilad - rhywle ar dir Pen y Bryn - wedi ei godi rhwng 1303-1306, cofnodir y manylion a bod gwith eitha trwm a oedd yn cynnwys cludo cerrig wedi'u siapio a [[calch|chalch]] i wnued mortar. Does dim olion o gerrig mawr ar y safle arall - safle'r Mŵd, a chredir fod y safle yn y fan honno braidd yn fach i lys eitha mawr.<ref>A Brief Report on Pen y Bryn and Aber, Gwynedd. Paul Martin Remfry. Castle Studies Research & Publishing Astudiaethau Castell Ymchwil A Cyhoeddi. 2012. tud 110-112. [http://www.castles99.ukprint.com/PenyBryn.pdf] {{Webarchive|url=https://web.archive.org/web/20140407090906/http://www.castles99.ukprint.com/PenyBryn.pdf |date=2014-04-07 }}; adalwyd 5 Tachwedd 2012</ref> Gwyddys hefyd i Rys a Jane Thomas fyw yma yn 1553, gan ei brynnu oddi wrth Coron Lloegr. Mae'r pren yn nho'r prif dŷ wedi'u dyddio i rhwng 1619 a 1624.<ref>[http://www.coflein.gov.uk/en/site/32/details/PEN-Y-BRYN%2C+ABER/ Main range tree-ring dated 1619-24. Tree-ring dating commissioned by the North-west Wales Dendrochronological Project in association with RCAHMW, and reported in Vernacular Architecture 41 (2010), tud. 114: ABER, Pen-y-bryn (Garth Celyn) (SH 6582 7273) Torrwyd y coed rhwng 1619–24.] Gwefan Coflein</ref> Gwyddys hefyd fod y tŷ wedi'i adeiladu ar chwe chyfnod a bod hanes hir i'r tŷ cyn iddo gael to newydd tua 1620.<ref>''A Brief Report on Pen y Bryn and Aber, Gwynedd. Paul Martin Remfry. Castle Studies Research & Publishing'' (Astudiaethau Castell Ymchwil A Cyhoeddi, 2012), t. 6. http://www.castles99.ukprint.com/PenyBryn.pdf {{Webarchive|url=https://web.archive.org/web/20140407090906/http://www.castles99.ukprint.com/PenyBryn.pdf |date=2014-04-07 }}, adalwyd 5 Tachwedd 2012</ref> Codwyd y tŵr ar ôl gweddill y tŷ a chafwyd gryn ychwanegiadau yn y 18g.
 
==Llys Tywysogion Gwynedd yn Aber?==
Roedd gan [[Tywysogion Gwynedd|Dywysogion Gwynedd]] lys yn [[Abergwyngregyn]]. Mae ei union leoliad yn bwynt dadleuol; dywedir fod dau safle'n bosibl, naill ai ger Pen y Mŵd, gerllaw ar lan yr afon, a'r llall ar safle Garth Celyn.<ref>Tystiolaeth Garth Celyn. Gweneth Lilly, Llanfairfechan. Y Traethodydd, Cyf. CLIII (644-647) 1998 tt. 145-7. [http://welshjournals.llgc.org.uk/browse/viewpage/llgc-id:1134021/llgc-id:1161783/llgc-id:1161938/get650/] {{Webarchive|url=https://web.archive.org/web/20140506140453/http://welshjournals.llgc.org.uk/browse/viewpage/llgc-id:1134021/llgc-id:1161783/llgc-id:1161938/get650/ |date=2014-05-06 }}; adalwyd 21 Tachwedd 2012</ref> Ceir adfeilion o'r Oesoedd Canol yng Ngarth Celyn, wedi cael eu dehonglu fel gwaith maen ond sy'n anodd eu ddyddio.<ref>"''The complex included other structures, including a barn or gatehouse (possibly rebuilt about 1700 on earlier stonework) and the present tower."''[http://www.coflein.gov.uk/en/site/31424/details/PEN-Y-BRYN%2C+BARN%2C+ABER/ PEN-Y-BRYN, BARN, ABER]; adalwyd ???</ref><ref>''A Brief Report on Pen y Bryn and Aber, Gwynedd. Paul Martin Remfry. Castle Studies Research & Publishing ''Astudiaethau Castell Ymchwil A Cyhoeddi. 2012. Tud 113. [http://www.castles99.ukprint.com/PenyBryn.pdf] {{Webarchive|url=https://web.archive.org/web/20140407090906/http://www.castles99.ukprint.com/PenyBryn.pdf |date=2014-04-07 }}</ref> Wrth y Mŵd mae Ymddiriedolaeth Archaeolegol Gwynedd wedi dadorchuddio adeilad o Oes y Tywysogion, a'i nodi fel llys brenhinol.<ref>[http://www.coflein.gov.uk/en/site/309171/details/THE+LLYS+AT+ABER%2C+HOUSE+EXCAVATED+AT+PEN+Y+MWD/ "THE LLYS AT ABER, HOUSE EXCAVATED AT PEN Y MWD"]; adalwyd 21 Chwefror 2011</ref><ref>[http://www.coflein.gov.uk/en/site/95692/details/ABER+CASTLE+OR+PEN-Y-MWD+MOUND/ "ABER CASTLE OR PEN-Y-MWD MOUND"]</ref><ref>[http://news.bbc.co.uk/local/northwestwales/hi/people_and_places/history/newsid_9140000/9140324.stm ''John Roberts, archaeologist for the Snowdonia National Park Authority. Final viewing for Abergwyngregyn's Welsh princes site at news.bbc.co.uk'']</ref> Ers 1988, haerwyd mai safle'r tŷ presennol yw safle llys y Tywysogion,<ref name="abergwyngregyn.co.uk"/>
 
==Cyfnod y Tywysogion==