Thomas de Clare was a notable figure in the 13th century, known primarily for his role as a nobleman in Ireland. He was a member of the de Clare family, which held significant power and land in both England and Ireland. His lineage connected him to the Norman invasion of Ireland, which greatly influenced the region's history. De Clare is often remembered for his involvement in the conflicts between the Irish clans and the Anglo-Norman settlers. His actions contributed to the ongoing struggles for control over land and power in Ireland during a time of significant political change.