On 22 Jun 1402 Owain ap Gruffudd "Glyndŵr" Mathrafal Prince Powys (age 43) defeated the army of [his future son-in-law] Edmund Mortimer (age 25) at Knighton, Radnorshire [Map], who was captured, at the Battle of Bryn Glas.

King Henry IV of England (age 35) made no attempt to ransom Edmund Mortimer (age 25) and, as a consequence, Edmund Mortimer (age 25) changed his allegiance, and subsequently married Owain's (age 43) daughter.

On 25 Jun 1402 Walter Devereux (age 41) died from wounds.

On 14 Sep 1402 Henry Percy 1st Earl of Northumberland (age 60) and his son Henry "Hotspur" Percy (age 38) lay in wait at Homildon Hill [Map] for the Scots to return from their laying waste to Northumberland. The Battle of Homildon Hill was a victory for the English forces whose longbowmen decimated the Scottish schiltrons. Henry Fitzhugh 3rd Baron Fitzhugh (age 44) fought for the English.

John Swinton was killed.

Thomas Dunbar 2nd Earl Moray (age 31) and Henry Sinclair 2nd Earl Orkney (age 27) were captured.

Archibald Douglas 1st Duke Touraine (age 30) was wounded. King Henry IV of England (age 35) forbade the ransoming of Scottish prisoners so that he could concentrate on the Welsh. By doing so he created a rift with the Percy family who subsequently defected to Owain ap Gruffudd Glyndŵr (age 43).

William Stewart of Jedworth and Teviotdale (age 46) was executed by Henry "Hotspur" Percy (age 38) having been captured.

John Stewart 1st of Dalswinton and Garlies (age 32) fought at the Battle of Homildon Hill.

Around May 1405 Richard Grey 1st or 4th Baron Grey of Codnor (age 34) and Dafydd Gam Brecon (age 25) decisively defeated the Welsh army at the Battle of Pwll Melyn aka Usk. [his son] Gruffudd ab Owain Glyndŵr Mathrafal (age 30) was captured. [his brother] Tudur ap Gruffudd Mathrafal Lord Gwyddelwern (age 48) was killed. The Welsh lost around 1500 men with 300 prisoners being beheaded following the battle. The battle marked the beginning of the end of Owain Glyndŵr's (age 46) revolt.