Compact tree of Sir Admiral John Howard
| King John Lackland 1166–1216 | |||||||||||||
| Richard “King of the Romans” Plantagenet 1209–1272 | Richard “Earl of Cornwall” de Cornwall 1252–1280 | Joan de Valletort 1214–1267 | |||||||||||
| Countess Isabella of Gloucester 1173–1217 | |||||||||||||
| Sir John Howard 1276–1331 |
|
Joan de Cornwall 1286–1342 | |||||||||||
| Joan St. Owen 1260–1316 | |||||||||||||