Thomas de Clare, Lord of Thomond, Chancellor of Ireland, was born circa 1245 to Richard de Clare, 6th Earl of Hertford (1222-1262) and Maud de Lacy, Countess of Lincoln (1223-c1287) and died 29 August 1287 of unspecified causes. He married Juliana FitzGerald (c1263-1300) February 1275 JL . Charlemagne (747-814)/s, Hugh Capet (c940-996)/s, William I of England (1027-1087)/s.
|Offspring of Thomas de Clare, Lord of Thomond and Juliana FitzGerald (c1263-1300)|
|Maud de Clare (c1276-1327)||1276||1326||Robert de Clifford, 1st Baron de Clifford (1274-1314)|
|Gilbert de Clare (1281-1308)|
|Richard de Clare (aft1281-1318)|
|Margaret de Clare (1287-c1333)||1287||1333||Gilbert de Umfraville (-c1307) Gilbert de Umfraville (-c1307) Bartholomew de Badlesmere (c1275-1322)|