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.