the Board and maintaining admiralty records. Its primary component to deliver this is the Admiralty Secretariat, sections of the Secretariat (other than those which provide Common Services) were known as Branches. Board of Admiralty When the office of Lord High Admiral was in commission, as it was for most of the 18th, 19th and 20th centuries, until it reverted to the Crown, it was exercised by a Board of Admiralty, officially known as the Commissioners for Exercising the Office of Lord High Admiral of the United Kingdom of Great Britain and Northern Ireland, &c. (alternatively of England, Great Britain or the United Kingdom of Great Britain and Ireland depending on the period). The Board of Admiralty consisted of a number of Lords Commissioners of the Admiralty. The Lords Commissioners were always a mixture of admirals, known as Naval Lords or Sea Lords and Civil Lords, normally politicians. The quorum of the Board was two commissioners and a secretary. The president of the Board was known as the First Lord of the Admiralty, who was a member of the Cabinet. After 1806, the First Lord of the Admiralty was always a civilian, while the professional head of the navy came to be (and is still today) known as the First Sea Lord. Lords Commissioners of the Admiralty (1628–1964) The Lords Commissioners of the Admiralty were the members of The Board of Admiralty, which exercised the office of Lord High Admiral when it was not vested in a single person. The commissioners were a mixture of politicians without naval experience and professional naval officers, the proportion of naval officers generally increasing over time. Key Officials First Lord of the Admiralty The First Lord of the Admiralty or formally the Office of the First Lord of the Admiralty was the British government's senior civilian adviser on all naval affairs and the minister responsible for the direction and control of the Admiralty and Marine Affairs Office later the Department of Admiralty.(+) His office was supported by the Naval Secretariat. First Sea Lord and Chief of Naval Staff The First Sea Lord and Chief of Naval Staff was the Chief Naval Adviser on the Board of Admiralty to the First Lord and superintended the offices of the sea lords and the admiralty naval staff. Navy Board The Navy Board was an independent board from 1546 until 1628 when it became subordinate to, yet autonomous of