Gruffudd ab Adda of Dôl-goch and Ynysymaengwyn was bailiff of the commote of Ystumanner in 1330 and 1334. His daughter Nest married Llywelyn ap Cynwrig ab Osbwrn Wyddel, and Ynysymaengwyn was to remain in the hands of their direct male descendants for well over two centuries.
Gruffudd ab Adda of Dôl-goch and Ynysymaengwyn was bailiff of the commote of Ystumanner in 1330 and 1334. His daughter Nest married Llywelyn ap Cynwrig ab Osbwrn Wyddel, and Ynysymaengwyn was to remain in the hands of their direct male descendants for well over two centuries.
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