Sir Glanmor Williams (5 May 1920 – 24 February 2005) was one of Wales's most eminent historians.Sir Glanmor was born in Dowlais, into a working-class family, and was educated at Cyfarthfa Grammar School. He studied at Aberystwyth alongside Alun Lewis and Emyr Humphreys, becoming a specialist in the early modern period of Welsh history.