Member Information
| Full Name | ♂️ John I "Sir Knight - Keeper of Portchester Castle" de St. John -  |
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| Birth | #1 | Date of Birth | ABT 1235 |
| Place of Birth | Basing, Hampshire, England | ||
| Spouse | #1 | Name | Alice FitzPiers-FitzReynold |
| Children | ♂️ Edward I St. John, ♂️ John II "Sir Knight - 1st Lord St. John of Basing" St. John, ♀️ Agnes de St. John | ||
| Death | #1 | Date of death | 22 SEP 1302 |
| Place of death | Basing, Hampshire, England | ||