Dafydd ab Ieuan , better known by his English name David Holbache, was a Welsh politician, best known for founding Oswestry School in 1407.
Dafydd, was born in the mid14th century to Ieuan Gch ap Dafydd ab Iorwerth and Angharad ferch Iorwerth ap Griffri Fychan. His fathers family had been seated at Pentrehylin, Dudleston, near Ellesmere, Shropshire since the early 13th century. Pentrehylin means Helyins village in English and is named for Holbaches ancestor Heilin ap Trahaearn ab Iddon. Heilin ap Trahaearn claimed descent from Tudur Trefor ab Ynyr, a 10thcentury lord of Maelor Cantref and a founder of one of the Fifteen Tribes of Wales. His mothers family also claimed paternal descent from Trahaearn ab Iddon.
Source: Wikipedia