Elizabeth Leycester was born circa 1318 in United Kingdom to Nicholas Leycester (-1349) and Mary de Mobberley (-c1318) . She married William Mainwaring (1316-1364) .
Children
| Name | Birth | Death | Joined with |
| John Mainwaring | |||
| Randle Mainwaring (1367-1456) | 1367 Over Peover, Cheshire, England, United Kingdom | 1456 Over Peover, Cheshire, England, United Kingdom | Margery de Venables (1369-1459) Emme Farringon |
| Thomas Mainwaring | |||
| Alan Mainwaring | |||
| Richard Mainwaring | |||
| Emme Mainwaring | |||
| Ellen Mainwaring | |||
| Joan Mainwaring | |||
Siblings
| Name | Birth | Death | Joined with |
| Elizabeth Leycester (c1318-) | 1318 United Kingdom | William Mainwaring (1316-1364) | |
| John Leycester (-1398) | |||
| Margaret Leycester (-c1405) | |||