| b 09 Oct 1299, Bampton, Devonshire, Devonshire, England | William Cogan | > | d 20 Apr 1368, , , , Bampton Devon | John Cogan |
| John Cogan | b 1203 | Gerald Fitz_Maurice | ||
| | b 1245 | Juliana Fitz_Maurice | Johanna Geneville | ||
| Thomas Cogan | d 26 Apr 1302 | b 1217 | ||
| |b 1286 | | | |||
| |d 20 Feb 1314 | Mrs-John De Cogan | |||
| | | b 1262 | |||
| Richard De Cogan | ||||
| |Mary De Montagu | |m 10 May 1327 | |||
| |Of, , Somersetshire, England | | | |||
| Petronilla | ||||
| b 1286 | | | |||
| 1 | < | William Cogan, [Sir Knight] |