William de Mowbray , of Kirklington, Sir 
William de was born about 1230 in Kirklington, Yorkshire, England. William de's father was Walter de Mowbray , of Kirklington. His paternal grandfather was Roger de Mowbray , of Kirklington, Sir. He was an only child. He died in 1286.
He had a biological son named William (John) de.
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Children
William (John) de Mowbray , of Kirklington
William (John) de was born about 1255 in Kirklington, Yorkshire, England. He died in 1293.
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