Admiralty
It evolved from *Admiralty Navy War Council, (1909–1912) which in turn became the Admiralty War Staff, (1912–1917) before finally becoming the Admiralty Naval Staff in 1917. It was the former senior command, operational planning, policy and strategy department within the British Admiralty. It was established in 1917 and existed until 1964 when the department of the Admiralty was abolished, and the staff departments function continued within the Navy Department of the Ministry of Defence until 1971 when its functions became part of the new Naval Staff, Navy Department of the Ministry of Defence.
Admiralty in the 17th century
After 1603 the English and Scottish fleets were organized together under James I but the efficiency of the Navy declined gradually, while corruption grew until brought under control in an inquiry of 1618. James concluded a peace with Spain and privateering was outlawed. Between 1618 and 1628, a Navy Commission temporarily replaced the Navy Board, due to misappropriation of public funds by board commissioners. After the inquiry was over the office of the Lord High Admiral (held by the Duke of Buckingham) was restored. However, he was murdered and King Charles I put the office into commission. This led to the creation of a new Board of Admiralty which in its early formation was just the Privy Council in another reincarnation. This in turn also led to the removal of the Admiralty Court from direct control of the Lord High Admiral's. His office was temporarily restored again in 1638, but then put in commission once more after 1679 the Lords Commissioners of Admiralty became the permanent officers responsible for administration of the Navy.
Notes: "the Secretary of State England for the period 1628 to 1679 was responsible for all policy decisions and direction on behalf of the government due to a continued state of war".