Earl Thomond is in Earl Ireland.
In 1756 Percy Wyndham O'Brien 1st Earl Thomond [aged 43] was created 1st Earl Thomond.
In 1581 Connor O'Brien 3rd Earl of Thomond [aged 47] died. His succeeded son Donogh O'Brien 4th Earl Thomond succeeded 4th Earl Thomond.
After 6th November 1585 Donogh O'Brien 4th Earl Thomond and Elizabeth Fitzgerald Countess Thomond were married. Elizabeth Fitzgerald Countess Thomond by marriage Countess Thomond. She the daughter of Gerald "Wizard Earl" Fitzgerald 11th Earl of Kildare [aged 60] and Mabel Browne Countess Kildare [aged 49]. They were second cousin once removed.
On 26th July 1639 Henry O'Brien 5th Earl Thomond [aged 51] died. His succeeded brother Barnabas O'Brien 6th Earl Thomond succeeded 6th Earl Thomond.
In November 1657 Barnabas O'Brien 6th Earl Thomond died. His succeeded son Henry O'Brien 7th Earl Thomond [aged 37] succeeded 7th Earl Thomond.
Before 2nd May 1691 Henry O'Brien 7th Earl Thomond [aged 71] and Sarah Russell Countess Thomond [aged 53] were married. Sarah Russell Countess Thomond by marriage Countess Thomond. He the son of Barnabas O'Brien 6th Earl Thomond and Anne or Mary Fermor.
On 2nd May 1691 Henry O'Brien 7th Earl Thomond [aged 71] died. His succeeded grandson Henry O'Brien 8th Earl Thomond [aged 2] succeeded 8th Earl Thomond.
In 1707 Henry O'Brien 8th Earl Thomond [aged 18] and Elizabeth Seymour Countess Thomond [aged 22] were married. Elizabeth Seymour Countess Thomond by marriage Countess Thomond. She the daughter of Charles Seymour 6th Duke of Somerset [aged 44] and Elizabeth Percy Duchess Somerset [aged 39]. He the son of Henry Horatio O'Brien and Henrietta Somerset Countess Suffolk [aged 38]. They were half fifth cousins.
Henry O'Brien 5th Earl Thomond and Mary Brereton Countess Thomond were married. Mary Brereton Countess Thomond by marriage Countess Thomond. He the son of Donogh O'Brien 4th Earl Thomond and Elizabeth Fitzgerald Countess Thomond.
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Henry O'Brien 5th Earl Thomond succeeded 5th Earl Thomond.