Dudley Alexander Sydney Cosby, 1st Baron Sydney (c. 1730 – 22 January 1774), was an Irish politician and diplomat.
Cosby was the son of Pole Cosby, of Stradbally, Queen’s County, and Mary, daughter of Henry Dodwell. Dudley Cosby was his grandfather.
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- January 23, 1774
Dudley Cosby (Baron Sydney), Former MP for Carrick, Commits Suicide
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Jacob Poolem antiquary, died in Growtown, Co. Wexford