William Proby, 5th Earl of Carysfort KP (18 January 1836 – 4 September 1909), known as William Proby until 1872, was a British peer. Carysfort was the fourth son and youngest child of

Admiral Admiral is one of the highest ranks in many navies. In the Commonwealth nations and the United States, a "full" admiral is equivalent to a "full" general in the army or the air force. Admiral is ranked above vice admiral and below admiral of ...

Granville Proby, 3rd Earl of Carysfort, and his wife Isabella (née Howard), who died only four days after his birth. He was educated at Eton and

Trinity College, Cambridge Trinity College is a Colleges of the University of Cambridge, constituent college of the University of Cambridge. Founded in 1546 by King Henry VIII, Trinity is one of the largest Cambridge colleges, with the largest financial endowment of any ...

. He was commissioned as a

Captain Captain is a title, an appellative for the commanding officer of a military unit; the supreme leader or highest rank officer of a navy ship, merchant ship, aeroplane, spacecraft, or other vessel; or the commander of a port, fire or police depa ...

in the part-time Wicklow Militia on 16 May 1861, retiring on 26 March 1872. He served as High Sheriff of Wicklow in 1866 and as Lord-Lieutenant of County Wicklow from 1890 to 1909 and was made a Knight of the Order of St Patrick in 1874. In 1872 he succeeded his elder brother in the earldom and entered the

House of Lords The House of Lords is the upper house of the Parliament of the United Kingdom. Like the lower house, the House of Commons of the United Kingdom, House of Commons, it meets in the Palace of Westminster in London, England. One of the oldest ext ...

. He owned almost 26,000 acres in Counties Wicklow, Northampton, Dublin and Kildare.The great landowners of Great Britain and Ireland
/ref> Lord Carysfort married Charlotte Mary, daughter of Reverend Robert Boothby Heathcote, in 1860. The marriage was childless. He died in September 1909, aged 73, when all his titles became extinct. The Countess of Carysfort died in 1918.

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* * {{DEFAULTSORT:Carysfort, William Proby, 5th Earl of 1836 births 1909 deaths Alumni of Trinity College, Cambridge Heathcote family Knights of St Patrick Lord-lieutenants of Wicklow People educated at Eton College High sheriffs of Wicklow Wicklow Militia officers Earls of Carysfort