~1115, William born in England, heir & s/o §§Baron Alan de Percy & Lady Emma de Gent.
~1120, Adeliza born in Tonbridge Castle, Kent, England, d/o 159916224. Earl Richard de Clare & 159916225. Countess Adelize de Gernon.
12/22/1135, Stephen crowned king of England; usurping Empress Matilda, d/o King Henry I; and starting a civil war that would last until 1153.
4/1136, William present at King Stephen’s court.
7/1138, William’s father died.
~1138, William married Adeliza.
8/22/1138, William fought at the Battle of the Standard on Cowton Moor near Northallerton in Yorkshire between the Scottish and the English, fighting for King Stephen. The Scots had superior numbers, but English archers held off repeated attacks.
1145-53, Henry de Percy [brother of William] witnessed a Charter of William de Percy to Whitby abbey.
1152-53, Alan de Percy gave land to Whitby abbey, witnessed by his brothers William and Henry.
2/1155 at Nottingham, William de Perci witnessed a royal charter to the abbey of St. Hilda of Whitby. (S) CH&I.H.II., P6.
By 1164, Adeliza died.
1164-66, William married 2nd Sibyl de Valgones, widow of Robert de Ros of Helmsley.
1175, William died.
Children of William and ?:
i. Agnes de Percy (1947060761), born ~1140 in England.
ii. Countess Maud de Percy, born ? in England.
By 1175, Maud married William de Newburgh, earl of Warwick [his 2nd], s/o 243393932. Earl Roger de Newburgh & 243393933. Countess Gundred de Warren.
4/1175, Agnes de Percy and her sister Maud de Percy [married to William, earl of Warwick] inherited the honor of Topcliffe. (S) Judges, Administrators & Common Law, Turner, 1994, P281.
11/15/1184, William died in the Holy Land; his brother Waleran succeeding.
1204, ‘Mathildis de Percy comitissa de Warwic, filia Willielmi de Perci’ donated property to Sawley abbey [Yorkshire], for the souls of ‘patris mei Willielmi de Percy et Adalidis de Tunbrige matris meæ et Alani de Percy fratris mei et Agnetis sororis meæ.’ (S) FMG. [Apparently her brother Alan died before her without heirs.]
1204, Maud died without heirs.