Seán Mac Gearailt, 12 Iarla Dheasumhan, de facto
Deartháir le Tomás Mac Gearailt, 11ú Iarla Dheasumhan, ab ea Seán Mac Gearailt, 12ú Iarla Dheasumhan de facto (d'éag Nollaig 1536).[1] Ar bhás a dhearthár sa bhliain 1534, cheistigh Seán teideal gharmhac a dhearthár Séamus Mac Gearailt, 12ú Iarla Dheasumhan don iarlacht, de jure.[2]
  | |
| Beathaisnéis | |
|---|---|
| Breith | 15 haois |
| Bás | Nollaig 1536 (Féilire Ghréagóra) |
| Eile | |
| Teideal uasal | Iarla Dheasumhan |
| Teaghlach | Rishliocht Mhic Gearailt |
| Céile | Maud O'Brien (en)  |
| Páiste | Séamus Mac Seáin Mac Gearailt, 13ú Iarla Dheasumhan, Catherine FitzGerald, Maurice FitzJohn FitzGerald, Mary FitzGerald |
| Athair | Tomás Mac Gearailt agus Ellice Barry |
Tagairtí
cuir in eagar- ↑ Cokayne, George Edward, Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Extant, Extinct, or Dormant. Volume III. London: George Bell & Sons. 1890. p. 86
- ↑ Webb, Alfred. A Compendium of Irish Biography. Dublin: 1878.