Baron William (Als Gernons) Percy 
William, known as Als Gernons, was born in 1030. Als Gernons' father was Ld. Geoffry Percy. His paternal grandfather was Manfred. He was an only child. He died at the age of 66 in 1096 in Mountjoy near Jerusalem.General Notes
pg 1998, Burke's "Extant Peerage & Baronetage etc" 1970 edition
pg 423, Burkes Extinct Peerage
They had a son named The Great.
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Children
Baron Alan (The Great) Percy
Alan, known as The Great, was born about 1069. He died in 1120. He was buried in Whitby.
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