Mountbattens) either by his second wife, Clementia of Burgundy, or by a mistress (see Dukes of Brabant family tree). He was also brother-in-law to King Henry I, whose second wife was Joscelin's step-sister Adeliza of Louvain. Richard de Percy (d. 1244), 5th feudal baron of Topcliffe, signatory to Magna Carta. Died childless. Succeeded his elder brother Henry de Percy (d.1198), the 4th Baron Topcliffe, whose son William III de Percy (1197-1245) became Richard's heir. William de Percy, (1197–1245), 6th feudal baron of Topcliffe Henry de Percy, 7th feudal baron of Topcliffe (1228–1272) Henry de Percy, 1st Baron Percy of Alnwick (1273–1314), 7th feudal baron of Topcliffe and 1st baron by writ. Henry de Percy, 2nd Baron Percy of Alnwick (1299–1352) Henry de Percy, 3rd Baron Percy of Alnwick (see below) Thomas Percy (d. 1369), Bishop of Norwich Henry de Percy, 3rd Baron Percy of Alnwick (1320–1368) Henry Percy, 1st Earl of Northumberland (1341–1408) (forfeit 1405), helped Henry IV seize the throne, later rebelled against him Sir Henry Percy (1364/1366–1403), also called Harry Hotspur, helped Henry IV seize the throne but later rebelled against him, killed at the Battle of Shrewsbury Henry Percy, 2nd Earl of Northumberland (see below) Lady Elizabeth Percy (c. 1390 – 1437) Henry Percy, 2nd Earl of Northumberland (1394–1455), supporter of King Henry VI, killed at the beginning of the Wars of the Roses Henry Percy, 3rd Earl of Northumberland (see below) Thomas Percy, 1st Baron Egremont (1422–1460) Katherine Percy, Countess of Kent (1423 – c. 1475) Ralph Percy (d.1464), knight, Lancastrian supporter in the Wars of the Roses William Percy (1428–1462), Bishop of Carlisle Henry Percy, 3rd Earl of Northumberland (1421–1461) (forfeit 1461), Lancastrian leader in the Wars of the Roses, killed at the Battle of Towton Henry Percy, 4th Earl of Northumberland (see below) Margaret Percy (b. c. 1447) Henry Percy, 4th Earl of Northumberland (1449–1489) (restored 1470), aligned with Yorkists, present but inactive at the Battle of Bosworth Field Henry Algernon Percy, 5th Earl of Northumberland (see below) Eleanor Percy, Duchess of Buckingham (1474–1530), daughter of the 4th Earl Alan Percy (c. 1480 – 1560), son of the 4th Earl, English churchman and academic Anne FitzAlan, Countess of Arundel (1485–1552), daughter of the 4th Earl Thomas Percy (1560–1605), great-grandson of the 4th Earl, participated in the Gunpowder Plot Henry Algernon Percy, 5th Earl of Northumberland (1478–1527) Henry Percy, 6th Earl of Northumberland (1502–1537), betrothed