Adelaer Adelaar, or Adder (the Eagle), a surname given, on account of his gallantry, to Coet Sivertsen, born in Brevig, Norway, Dec. 16, 1622, died in Copenhagen, Nov. 5, 1675. He rose from the position of a common sailor, in which capacity he served from 1637 to 1642 in the Dutch navy, to the rank of admiral, first in the Venetian and afterward in the Danish service. During the wars of Venice against the Turks, Adelaar gave evidence of his daring spirit by fighting his way in 1654, with the ship to the command of which he had risen by his skill, through 67 Turkish galleys, sinking 15 of them with about 5,000 Turks on board, all of whom are said to have perished. For this exploit Venice conferred upon him the order of St. Mark, the title of lieutenant general of the admiralty, and a pension. In 1663, after returning for a short time to the Dutch navy, Adelaar accepted employment under the Danish government, and in 1675 became commander-in-chief of the fleet just about to act against Sweden. He died before it sailed.