Nielsen Hayden genealogy
Family: Richard de Cornwall / Joan (F9901)
m. Bef 1280Richard of Cornwall, King of the Romans (1209-1272) 
|
Walter de Cornwall ( -1313)  |
| Richard de Cornwall ( -1296)
|
Joan ( -1321) |
| Joan de Cornwall ( -1341) |
| Geoffrey de Cornwall ( -1335) |