Family: William De Mainwaring / Agnes De Adrerne (F12245)
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 | Roger De Mainwaring (1250- )
|
 | Mrs-Roger De Mainwaring (1254- ) |
| Peter De Arderne, [Sir Knight] (1241-1292)
|
| Margaret Or Margery (1250- ) |
| John De Arderne, [Sir Knight] (1275-1308)  |
| William De Mainwaring (1276- )
|
| Agnes De Adrerne (1276- )
|
| William Mainwaring (1225- ) |
| Matilda De Mainwaring (1310- ) |