James Du Pre Alexander, 3rd Earl of Caledon

James Du Pre Alexander, 3rd Earl of Caledon (27 July 1812 – 30 June 1855), styled Viscount Alexander from birth until 1839, was a soldier and politician.

Born into an Ulster-Scots aristocratic family in London, he was the son of The 2nd Earl of Caledon and Lady Catherine Yorke. He was educated from 1824 to 1828 at Eton College and then at Christ Church, Oxford. He was appointed High Sheriff of Armagh in 1836 and was Member of Parliament for Tyrone between 1837 and 1839. He succeeded to the title of Earl of Caledon on the death of his father on 8 April 1839. He was then elected to the House of Lords as a Representative Peer for Ireland in 1841. He gained the rank of captain in the service of the Coldstream Guards and was Colonel of the Tyrone Militia.

He married Lady Jane Frederica Harriot Mary Grimston, daughter of James Walter Grimston, 1st Earl of Verulam and Lady Charlotte Jenkinson, on 4 September 1845 at St. Michael's, St. Albans, Hertfordshire, and had issue:

Lord Caledon died at the age of 42 at his house in Carlton House Terrace, London, on 30 June 1855 and was buried at Caledon in County Tyrone, Ireland. Lady Caledon died on 30 March 1888.

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