Owain Glyndŵr Declares Himself Prince

Date: June 14, 1404 • Location: Paris, France

This milestone marked the outbreak and beginning of this historic period, which spanned 1404–1421.

Welsh rebel leader Owain Glyndŵr, having declared himself Prince of Wales, allies himself with the French against King Henry IV of England.

Owain ap Gruffudd Fychan or Owain Glyndŵr was a Welsh nobleman and military commander in the late Middle Ages who led a revolt with the aim of establishing an independent Wales free from English rule. Owain was acclaimed Prince of Wales by his supporters on 16 September 1400, and following initial successes, the rebellion was able to take control of the entirety of the country between 1404 and 1405. However, an increase of English military pressure and the lack of foreign aid resulted in the loss of all rebel territory by 1409, after which Owain continued sporadic resistance until his disappearance from the historical record in 1412. He was never captured, and died in hiding around 1416.