John de St. John 
John de was born in 1086 in Compton, Sussexshire, England. John de's father was William de St. John and his mother was Olivia Fitz-Gears. His maternal grandfather was Ralph Fitz-Gears. He was an only child.
He had a biological son named Roger de.
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Children
Roger de St. John
Roger de was born in 1110 in Compton, Sussexshire, England. Roger de is no longer alive.
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