Professor of Scottish History and Literature University of Oxford. In 1929, Rait was appointed Principal of the University. He remained in post as professor for a year, publishing a "History of the Union Bank of Scotland" in 1930, but resigned later that year, succeeded by John Duncan Mackie, previously Professor of Modern History at Bedford College (predecessor institution of Royal Holloway), who had initiated the teaching of Scottish History at the University of St Andrews on being appointed a lecturer there at only twenty-two years old. His publications whilst in the chair included "Andrew Lang and the House of Stuart" (1935) and "The Earlier Tudors 1485-1558"
Tudors of Penmynydd of Snowdon and Constable of Beaumaris Castle, and his younger brothers Rhys ap Tudur and Gwilym ap Tudur, were among the personal retinue of Richard II of England. However, following that king's overthrow, Rhys, Gwilym and another brother, Maredudd ap Tudur, gave their allegiance to Owain Glyndŵr, the nephew of one of their father's wives and descended from many of the native Welsh princes including Llewellyn the Great. Rhys was executed in 1412 at Chester, and following Glyndŵr's demise much of the Tudors' lands were taken by the English crown, with the majority regranted to another branch of Ednyfed Fychan's