William de MAINWARING 
William de was born about 1116 in Warmingham, Cheshire, England. William de's father was Roger de MAINWARING. His paternal grandfather was Richard de MAINWARING. He was an only child. William de is no longer alive.
He had a biological son named Roger de.
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Children
Roger de MAINWARING
Roger de was born about 1130 in Warmingham, Cheshire, England. Roger de is no longer alive.