Gruffudd Fychan II (c. 1330-1369), Lord of Glyndyfrdwy and Cynllaith and father of Owain Glyndŵr, Prince of Wales
He later claimed that his ancestry stretched back to Sir Gruffudd Fychan of Denbigh, who had been knighted in the field at the Battle of Agincourt by Henry V in 1426.