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The position of 'head of The Post Office' was first entitled 'Postmaster General' under the Commonwealth Act of 1657. Previously he had been known by various titles, Master of the Posts, Comptroller General of the Posts and Postmaster of England. The Post Office Act of 1660 provided that 'one Master of the General Letter Office shall be from time to time appointed by the King's Majesty, his heirs and successors, to be made or constituted by Letters Patent under the Great Seal of England, by the name and style of his Majesty's Postmaster General'. The appointment was generally not made for a fixed length of term and Postmaster Generals were succeeded upon retirement or resignation. From 1691 two Postmasters General were appointed to hold office conjointly. At that time one was a member of the Whig party and the other a member of the Tory party. This joint appointment continued as a government policy until 1823, although the political ramifications lost much of their initial importance. Between the years of 1784 and 1831, the Post Offices of Great Britain and Ireland were separate and had separate Postmasters. The post of Receiver General was established in 1677, with the responsibility to receive and account for all payments received and expended by the Post Office. In 1855 these duties were combined with those of the Accountant General. The Office of Court Post, which was abolished [1798] was that of messenger responsible for conveying the sovereign's letters and those of his Principal Secretaries of State to the nearest stage of post town.