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'Cort Sivertsen Adeler' (16 december 1622- 5 november 1675), in Denmark known as 'Coort Sifvertsen Adelaer', in The Netherlands as 'Koert Sievertsen Adelaer' and in Italy as 'Curzio Suffrido Adelborst', is the name of honour given to 'Kurt Sivertsen', a famous Norwegian seaman, who rendered distinguished services to the Royal Dano-Norwegian Navy, the Dutch navy, and also to the Republic of Venice against the Turks.
He was born in Brevik in Norway as son of a shipper. At the age of fifteen he took service with the Dutch navy; in 1639 he fought under Lieutenant-Admiral Maarten Tromp at the Battle of the Downs. In 1642 he was first mate on the ''Grote St. Joris'', a Dutch ship hired by the fleet of Venice as the ''San Georgio Grande''. Sivertsen called himself ''Adelborst'' in this period, a Dutch name meaning "cadet". In 1645 he became captain of the ''San Georgio'' and entered full Venetian service. In 1650 the ''San Georgio'' became a flagship and Sivertsen therefore flagcaptain. In an action against the Turkish fleet on 13 May 1654 near the Dardanelles he broke with his ship a line of Turkish galleys and sank fifteen of them; next day the Turkish garrison of Tenedos surrendered to him. For this he was knighted in the Order of San Marco; the Venetian senate rewarded him with an annuity of 1400 golden ducats. In 1660 he was made Vice-Admiral.
Sivertsen had during this period maintained close connections with the Dutch Republic, his son Jan was raised there. Retiring from Venetian service he worked from 1661 till 1663 for an Amsterdam merchant house, having a supply contract with the Admiralty of Amsterdam, one of the five Dutch admiralties. In this period he changed his name to ''Adelaer'', Dutch for "Eagle". His son Jan Adelaer served as a cadet on the ship of the famous Dutch Vice-Admiral Michiel de Ruyter. In 1665, when the Second Anglo-Dutch War threatened, he was offered a position in the Dutch navy as a Vice-Admiral, but the refused. After the death of the Dutch supreme commander Lieutenant-Admiral Jacob van Wassenaer Obdam in the Battle of Lowestoft Adelaer was considered for this function but again indicated that he had no interest in it.
In 1663 Adelaer had begun working as an agent for the Danish navy, that in this period had close ties with the Dutch navy. When the leading Dutch military advisors in Denmark, such as Frederick Stachouwer and Volckert Schram, were recalled to the Dutch Republic because of their expertise in amphibious landings, to be employed in a planned landing on the English coast which in 1667 materialised as the Raid on the Medway, the Danes asked Adelaer to join the Danish navy as operational supreme commander, to supervise the modernisation of their fleet. In 1666 King Frederick III of Denmark personally convinced Adelaer by offering him a considerable sum of money. While in the Dutch Navy any commoner could be appointed in the highest positions, in Denmark it was still mandatory to be of nobility to command, so Adelaer became the Danish Knight ''Coort Sifvertsen Adelaer'' in order to become Admiral-General.
During Adelaer's command the navy was expanded with thirty new ships-of-the-line. In the years 1669 and 1670 he headed a diplomatic mission to South-India to establish trade relations with Coromandel.
Adelaer was a personal friend of the new Dutch supreme commander Lieutenant-Admiral Michiel de Ruyter who also had been knigthed in Denmark, for his victory over Sweden in 1659. A large part of their correspondence in Dutch has survived. In 1675 Denmark joined the Dutch in the Franco-Dutch War; Sweden then declared war. Adelaer commanded a single minor action against the Swedish fleet — the only time he would actually fight in Danish service — but during an epidemic that swept Scandinavia in the Fall Adelaer too was afflicted and died after many weeks of suffering on 5 November 1675 at Copenhagen. He was replaced as supreme commander on 8 May 1676 by a Dutch Admiral, Cornelis Tromp.
During the period of romantic nationalism in the 19th century, Adelaer gained the status of Norwegian naval hero, largely due to a novel by the romantic Danish writer Bernhard Severin Ingemann, who tended to embellish historical fact.