Family: John de SAINT JOHN, 1st Baron St.John of Basing / Isabel de COURTENAY (F9590)
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 | John de SAINT JOHN, 1st Baron St.John of Basing (1273-1329) |
 | Isabel de COURTENAY (1283- ) |
| Margaret SAINT JOHN (1308-1361)  |
| Hugh de SAINT JOHN, of Basing, 2nd Lord (1310-1335) |