1. WILLIAM¹ DE PERCY was born between 1164/5 and 1231, and died between 1224 and 1341. He married ELLEN DE BALLIOL. ^[7]
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SIR HENRY2 DE PERCY, b. about 1235[7]; d. on 29 Aug. 1272[7]; m. (RV-32) ELEANOR DE WARENNE, b. in 1251[7], d. about 1320[7], daughter of (RV-22) John, 7th Earl of Surrey and (AAU-16) Alice (de LUSIGNAN).

2. SIR HENRY² DE PERCY (William¹), son of (1) William¹ and Ellen (de BALLIOL) DE PERCY, was born about 1235^[7], and died on 29 Aug. 1272^[7]. He married (RV-32) ELEANOR DE WARENNE, daughter of (RV-22) John, 7th Earl of Surrey and (AAU-16) Alice (de LUSIGNAN), who was born in 1251^[7], and died about 1320^[7].
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HENRY3 DE PERCY, 1ST LORD PERCY, b. on 25 March 1273[7] in Petworth, Sussex, England, United Kingdom[7]; d. in Oct. 1314[8]; m. (QJ-7) ELEANOR DE ARUNDEL, d. in 1328[8], daughter of (QJ-4) Richard I, 8th Earl of Arundel and (ADR-18) Alasia (de SALUZZO).

3. HENRY³ DE PERCY, 1ST LORD PERCY (Henry², William¹), son of (2) Sir Henry² and (RV-32) Eleanor (de WARENNE), was born on 25 March 1273^[7] in Petworth^[7], and died in Oct. 1314^[8]. He married (QJ-7) ELEANOR DE ARUNDEL, daughter of (QJ-4) Richard I, 8th Earl of Arundel and (ADR-18) Alasia (de SALUZZO), who died in 1328^[8].
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HENRY4 DE PERCY, 2ND BARON PERCY, b. about 1300[8]; d. on 26 FEB 1351/2[8] in Warkworth, Northumberland, England[8]; m. (Q-105) IDOINE DE CLIFFORD, d. on 24 Aug. 1365[1, 3, 8], daughter of (Q-101) Robert, 1st Lord Clifford and (Q-110) Maud (de CLARE).

4. HENRY⁴ DE PERCY, 2ND BARON PERCY (Henry³, Henry², William¹), son of (3) Henry³, 1st Lord Percy and (QJ-7) Eleanor (de ARUNDEL), was born about 1300^[8], and died on 26 FEB 1351/2^[8] in Warkworth^[8]. He married (Q-105) IDOINE DE CLIFFORD, daughter of (Q-101) Robert, 1st Lord Clifford and (Q-110) Maud (de CLARE), who died on 24 Aug. 1365^{[1, 3, 8]}. ^{[5, 9]}
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MAUD5 DE PERCY, b. about 1330/1; d. between 1 Jan. and 18 Feb. 1379[4]; m. before 1362[4] (AEZ-6) JOHN DE NEVILLE, 3RD BARON NEVILLE, b. about 1329[4], d. on 17 Oct. 1388[4], son of (AEZ-5) Ralph, 2nd Baron Neville and (CI-5) Alice (de AUDLEY) (DE GREYSTOKE).

5. MAUD⁵ DE PERCY (Henry⁴, Henry³, Henry², William¹), daughter of (4) Henry⁴, 2nd Baron Percy and (Q-105) Idoine (de CLIFFORD), was born between 1303/4 and 1348, and died between 1317 and 18 Feb. 1379^[4]. She married before 1362^[4], (AEZ-6) JOHN DE NEVILLE, 3RD BARON NEVILLE, son of (AEZ-5) Ralph, 2nd Baron Neville and (CI-5) Alice (de AUDLEY) (DE GREYSTOKE), who was born about 1329^[4], and died on 17 Oct. 1388^[4]. ^{[2, 6, 9]}
Children: See (AEZ-6) John de NEVILLE, 3rd Baron Neville