Fourth Generation  

11. Lord Henry de PERCY 1st Baron of Alnwick [122002] (7th Baron Henry de PERCY of Topcliffe³, Baroness Eleanor de BALLIOL Percy², Ingleram of Harcourt (Lord)¹) was born on 25 Mar 1273 in Petworth Sussex England, died in Oct 1314 in Alnwick Northumberland England at age 41, and was buried in Fountains Abbey Yorkshire England.

General Notes: Wikipedia says, amongst other Things,
Henry de Percy, 1st Baron Percy of Alnwick (25 March 1273 \endash October 1314)[3] was a medieval English magnate.

He fought under King Edward I of England in Wales and Scotland and was granted extensive estates in Scotland, which were later retaken by the Scots under King Robert I of Scotland. He added Alnwick to the family estates in England, founding a dynasty of northern warlords. He rebelled against King Edward II over the issue of Piers Gaveston and was imprisoned for a few months. After his release, he declined to fight under Edward II at the Battle of Bannockburn, remaining at Alnwick, where he died a few months later, aged 41.
ALSO
Henry was born at Petworth in Sussex in 1273, seven months after his father's death, saving the family line from extinction, as two older brothers had died in infancy, and all six uncles had died without leaving any legitimate heirs. He was fortunate in having the powerful John de Warenne, 6th Earl of Surrey as his maternal grandfather. Henry was the son of Henry de Percy (d.1272), 7th feudal baron of Topcliffe, Yorkshire,[4] by his wife, Eleanor de Warenne, daughter of John de Warenne, 6th Earl of Surrey by Alice de Lusignan, Countess of Surrey, half sister of King Henry III.[5] His grandfather was William de Percy, and his great-great-grandfather was Jocelin de Louvain (d.1180) who had married Agnes de Percy (d.1203), one of the two daughters and co-heiresses of William II de Percy (d.1174/5), 3rd feudal baron of Topcliffe, whose descendants had adopted the surname "de Percy".

Henry married Baroness Eleanor FITZALAN Percy [122003]. Eleanor was born between 1282 and 1284 in Arundel Sussex England and died in Aug 1328 in Beverley Yorkshire England.

Children from this marriage were:

+ 12    i. Lord Henry de PERCY 2nd Baron of Alnwick [122000] was born on 6 Feb 1301 and died on 26 Feb 1352 at age 51.

   13    ii. William de PERCY [122162] was born in 1303 and died in 1355 at age 52.