Baron Butler of Moore Park, Co. Hertford, was created in the Peerage of England in 1666, for Thomas Butler, 6th Earl of Ossory (the eldest son of the 1st Duke of Ormonde). Four years previously, he had been called up to the Irish House of Lords by a writ of acceleration as the Earl of Ossory. As the Baron predeceased his father, his son James inherited the barony in 1680 and then the dukedom in 1688.
Baron Butler of Moore Park, Co. Hertford was created in the English Peerage in 1666 for Thomas Butler, 6th Earl of Ossory (the eldest son of the 1st Duke of Ormonde). Four years prior to that, he was summoned to the Irish House of Lords as the Earl of Ossory. Upon the Baron's death before his father, his son James inherited both the barony and the dukedom in 1680 and 1688 respectively.