Henry Percy was born 20 May 1364 at
Alnwick Castle in
Northumberland, the eldest son of
Henry Percy, 1st Earl of Northumberland, and Margaret Neville, daughter of
Ralph de Neville, 2nd Lord Neville of Raby, and Alice de Audley. He was
knighted by
King Edward III in April 1377, together with the future kings
Richard II and
Henry IV. In 1380, he was in Ireland with the
Earl of March, and in 1383, he travelled in
Prussia. He was appointed
Warden of the East March either on 30 July 1384 or in May 1385, and in 1385 accompanied Richard II on an expedition into Scotland. "As a tribute to his speed in advance and readiness to attack" on the Scottish borders, the Scots bestowed on him the name 'Haatspore'. In April 1386, he was sent to France to reinforce the garrison at
Calais and led raids into
Picardy. Between August and October 1387, he was in command of a naval force in an attempt to relieve the siege of
Brest. In appreciation of these military endeavours, at the age of 24 he was made a
Knight of the Garter in 1388. Reappointed as Warden of the East March, he commanded the English forces against
James Douglas, 2nd Earl of Douglas, at the
Battle of Otterburn on 10 August 1388, where he was captured, but soon ransomed for 7000 marks. of Percy captured by James Douglas, Earl of Douglas During the next few years Percy's reputation continued to grow. Although not 30, he was sent on a diplomatic mission to
Cyprus in June 1393 and appointed
Lieutenant of the Duchy of Aquitaine (1394–98) on behalf of
John of Gaunt,
Duke of Aquitaine. He returned to England in January 1395, taking part in Richard II's expedition to Ireland, and was back in Aquitaine the following autumn. In the summer of 1396, he was again in Calais. Percy's military and diplomatic service brought him substantial marks of royal favour in the form of grants and appointments, but despite this, the Percy family decided to support Henry Bolingbroke, the future Henry IV, in his rebellion against Richard II. On Henry's return from exile in June 1399, Percy and his father joined his forces at
Doncaster and marched south with them. After King Richard's deposition, Percy and his father were "lavishly rewarded" with lands and offices. Under the new king, Percy had extensive civil and military responsibility in both the East March towards Wales, where he was appointed
High Sheriff of Flintshire in 1399, and in the north toward Scotland. In north Wales, he was under increasing pressure as a result of the rebellion of
Owain Glyndŵr. In March 1402, Henry IV appointed Percy royal lieutenant in north Wales, and on 14 September 1402, Percy, his father, and the
Earl of Dunbar and March defeated a Scottish force at the
Battle of Homildon Hill. Among others, they made a prisoner of
Archibald Douglas, 4th Earl of Douglas. == Rebellion, death and exhumation ==