William was born in 1286 in Over By, Middlewich, Cheshire, England, the son of Roger Mainwaring and Christian de Birtles.
He died about 1339. The place is not known.
His wife was Mary de Davenport. They were married, but the date and place have not been found. Their four known children were sir William (1316-c1364), Roger (?->1334), Margery (?->1334) and Millicent (?->1334).
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sir William Mainwaring |
Roger Mainwaring |
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Christian de Birtles |
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| Event | Date | Details | Source | Multimedia | Notes | ||
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| Birth | 1286 |
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| Death | ABT 1339 |
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