As his father's age and health made it difficult for him to continue a guerilla campaign, Maredudd increasingly became seen as the leader of the remnants of the rebellion by the English, who named him as a principal individual in the pardons offered to surviving rebels.
[1] In 1416 he appears to have been in North Wales, attempting to rally opposition in this area with a force of Scots.
He is known to have rejected a Royal pardon for both himself and his father in 1417 proffered by officials of King Henry V of England.
[2] Claims that he became a Lancastrian courtier during this period and fought at Agincourt (on either side) seem to be based on a confusion with a different Maredudd ab Owain.
This is usually given as the formal end-date of the rebellion and the sign of final re-establishment of English control of Wales.