John was the son of unknown parents. The date and place of his birth have not been found.
He died about 1378. The place is not known.
His wife was Honora O'Brian. They were married, but the date and place have not been found. Their only known child was Maurice FitzJohn (?-c1398).
| Event | Date | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|
| Death | ABT 1378 |
|
| Attribute | Date | Description | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|---|
| Nobility Title | baron of Kerry and Lixnaw 5° |