The rank of general at sea, was the highest position of command in the English Parliamentary Navy, and approximates to the current rank of admiral. Alongside others, the generals at sea were also appointed as Commissioners for the Admiralty and Navy.

Robert Blake was an English naval officer who served as general at sea and the Lord Warden of the Cinque Ports from 1656 to 1657. Blake served under Oliver Cromwell during the English Civil War and Anglo-Spanish War, and as the commanding Admiral of the State's Navy during the First Anglo-Dutch War. Blake is recognized as the "chief founder of England's naval supremacy", a dominance subsequently inherited by the British Royal Navy well into the early 20th century. Despite this, due to deliberate attempts to expunge the Parliamentarians from historical records following the Stuart Restoration, Blake's achievements tend to remain relatively unrecognized. Blake's successes, however, are considered to have "never been excelled, not even by Nelson" according to one biographer, while Blake is often compared with Nelson by others.