William Mainwaring was born circa 1396 in Ightfield, Shropshire, England, United Kingdom to Randle Mainwaring (1367-1456) and Margery de Venables (1369-1459) and died 6 March 1499 Whitchurch, Shropshire, England, United Kingdom of unspecified causes. He married Margaret Warren (c1400-1437) 1422 JL in Ightfield, Shropshire, England, United Kingdom.
Children
| Name | Birth | Death | Joined with |
| Margery Mainwaring (c1433-1460) | 1433 Ightfield, Shropshire, England, United Kingdom | 1460 Egerton, Cheshire, England, United Kingdom | Philip Egerton (c1430-1474) |
| Thomas Mainwaring (c1437-1508) | 1437 Over Peover, Cheshire, England, United Kingdom | 1508 Over Peover, Cheshire, England, United Kingdom | Jane Sutton (c1434-1476) |
Siblings
| Name | Birth | Death | Joined with |
| John Mainwaring (?-bef1481) | |||
| William Mainwaring (c1396-1499) | 1396 Ightfield, Shropshire, England, United Kingdom | 6 March 1499 Whitchurch, Shropshire, England, United Kingdom | Margaret Warren (c1400-1437) |
| Randle Mainwaring (?-?) | |||
| Hugh Mainwaring (?-?) | |||
| Elizabeth Mainwaring (c1395-1481) | 1395 Peover Superior, Cheshire, England, United Kingdom | 25 February 1481 Gawsworth, Cheshire, England, United Kingdom | Ralph de Egerton (c1398-1452) |
| Cicely Mainwaring (-1502) | 1401 England | 24 May 1502 England | Thomas Fouleshurst (c1400-) |
| Joan Mainwaring (?-?) | |||
| Ellen Mainwaring (?-?) | |||
| Agnes Mainwaring (?-?) | |||
| Margaret Mainwaring (?-?) | |||
| Name | Birth | Death | Joined with |
| Hugh Mainwaring | |||
| Thomas Mainwaring | |||
| Daughter Mainwaring | |||
| Daughter Mainwaring | |||
| Daughter Mainwaring | |||
Residences
Footnotes (including sources)
| ‡ General |
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| ¶ Death |
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