Thomas de Clare, Lord of Thomond
| Thomas de Clare 1st Lord of Thomond |
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Arms of the de Clare Family
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| Hereditary | |
| Lord of Thomond | 1276 1287 |
| Predecessor | New Creation |
| Successor | Gilbert de Clare, 2nd Lord of Thomond |
| Spouse(s) | Juliana FitzGerald |
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Issue
Maud de Clare, Baroness de Welles
Gilbert de Clare, 2nd Lord of Thomond Richard de Clare, Steward of Forest of Essex Margaret de Clare, Baroness Badlesmere |
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Titles and styles
1st Lord of Inchiquin and Youghal
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| Family | de Clare |
| Father | Richard de Clare, 6th Earl of Hertford, 2nd Earl of Gloucester |
| Mother | Maud de Lacy |
| Born | 1245 Tonbridge Castle, Tonbridge, Kent, England |
| Died | 29 August 1287 Thomond, Ireland |
| Occupation | Peerage of England |
Thomas de Clare, 1st Lord of Thomond, 1st Lord of Inchiquin and Youghal was a Hiberno-Norman peer and soldier. He was the second son of Richard de Clare, 6th Earl of Gloucester and his wife Maud de Lacy, Countess of Gloucester. On 26 January 1276 he was granted the Lordship of Thomond by Edward I of England; he spent the next eight years attempting to conquer it from the O'Brien dynasty, kings of Thomond.
Thomas was born in about 1245 in Tonbridge, Kent, England, the second eldest son of Richard de Clare and Maud de Lacy. He and his brother Bogo received gifts from King Henry III when they were studying at Oxford from 1257–59. Thomas was a close friend and intimate advisor of Prince Edward of England, who would in 1272 accede to the throne as King Edward I. Together they took part in the Ninth Crusade. He held many important posts such as Governor of Colchester Castle (1266) and Governor of The City of London (1273). He was made Commander of the English forces in Munster, Ireland and created Lord of Inchiquin and Youghal. On 26 January 1276, he was granted the entire lordship of Thomond by King Edward.
That same year, he jointly commanded a Norman army along with Sir Geoffrey de Geneville, Justiciar of Ireland against the Irish clans of County Wicklow. They were joined by a contingent of men from Connacht led by his father-in-law Maurice FitzGerald, 3rd Lord of Offaly. Thomas and Justiciar de Geneville's forces attacked the Irish at Glenmalure, but they were soundly defeated and suffered severe losses.
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