| Family with parents |
| father |
Richard “King of the Romans” Plantagenet Birth: January 5, 1209 42 36 — Winchester Castle, Winchester, Hampshire, England Death: April 2, 1272 — Berkhamsted Castle, Hertfordshire, England |
| mother |
Joan de Valletort Birth: about 1214 — Winchester, Hampshire, England Death: 1267 — Modbury, Devon, England |
|
Marriage: — |
|
| himself |
Richard “Earl of Cornwall” de Cornwall Birth: about 1252 42 38 — Berkhamsted, Hertfordshire, England Death: 1280 — Berwick-upon-Tweed, Northumberland, England |
| Family with Joan St. Owen |
| himself |
Richard “Earl of Cornwall” de Cornwall Birth: about 1252 42 38 — Berkhamsted, Hertfordshire, England Death: 1280 — Berwick-upon-Tweed, Northumberland, England |
| wife |
Joan St. Owen Birth: 1260 — Winchester, Hampshire, England Death: October 6, 1316 — Cornwell, Chipping Norton, Oxfordshire, England |
|
Marriage: — |
|
| daughter |
Joan de Cornwall Birth: about 1286 34 26 — Thunnock, Lincolnshire, England Death: September 25, 1342 — Howard Chapel, East Winch, Norfolk, England |