sentences:  After a lawsuit with John Power, Sir Marcus and Lady Catharine retained the Power property, and Sir Marcus was raised into the Peerage of Ireland by creating him Viscount Tyrone in 1720.After the Jacobite rebellion of 1745, he was further elevated in 1746 as Earl of Tyrone (the same name of title as that of his father-in-law, but a new creation).After he died in 1763, Lady Catharine, now the Dowager Countess of Tyrone, had petitioned the Irish House of Lords to restore to her the "Barony de la Poer", which she asserted was created by writ for her grandfather Richard Power.