In 1551 Dromoland was listed in the will of Murrough O'Brien. He was first Tanist and in 1543 had been granted the title of first Earl of Thomond by Henry VIII. Murrough bequeathed Leamaneh Castle to his third son Donough MacMurrough O'Brien, and also gave him the castle and lands at Dromoland. In 1582 Donough was hanged in Limerick on charges of rebellion and the government decided that all his property would be forfeited to the Crown. Accordingly, Sir George Cusack, the sheriff, took possession of Dromoland. Some years later, Turlough O'Brien killed Cusack and various O'Briens attempted to re-possess Dromoland. The fourth Earl of Thomond claimed to have sole ownership and tried to exclude Donough's son, Conor MacDonough O'Brien. The outcome of this dispute is unclear.