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 of Rotterdam
The Admiralty of Rotterdam was founded in 1574 during the Dutch Revolt, when (after the Capture of Brielle) William I of Orange's supporters decided to pool their naval resources at Rotterdam. After a number of reorganisations seeking to foster cooperation between the admiralties, the structure of the five admiralties was determined and defined in a 1597 decision of the States-General of the Netherlands. The admiralty had branches for equipping warships, protecting overseas trade and traffic on the sea and rivers, collecting taxes, and jurisdiction over loot and prize-setting. This situation remained in place until the admiralties were dissolved in 1795.