William O'Brien, 3rd Earl of Inchiquin

William O'Brien, 3rd Earl of Inchiquin
Mary, née Villiers, daughter of Sir Edward Villiers, and sister of the 1st Earl of Jersey, married William, 3rd Earl of Inchiquin. On her wedding Queen Mary, to whom she had been a Maid of Honour, provided a wedding supper at Kensington Palace in London, plus £4,000 in cash and £1,000 in clothing and jewellery.

William O'Brien, 3rd Baron O'Brien of Burren, 8th Baron & 3rd Earl of Inchiquin PC (1662 – 24 December 1719) was an Irish nobleman.