Kongen af Assianthe (or Kongen af Assianto) was launched in Sweden in 1797.
Her owners, Jeppe Prætorius & Co. transferred her registry to Copenhagen. Between 1797 and 1803 Kongen af Assianthe made three voyages in the triangular trade between Copenhagen, West Africa, the Danish West Indies, and Copenhagen. That is, she was a slave ship, using her middle deck to carry captives. For Danish vessels, trading African captives was legal until 1 January 1803 when the 1792 law to abolish the enslaving trade came into effect.
The three voyages were:
Kongen af Assianthes return in 1803 corresponded with Denmark's ending Danish participation in the trans-Atlantic enslaving trade. This prohibition had been passed in 1792 but did not take effect until 1 January 1803. Thereafter, the ship was sold to a shipping company in Arendal. The most probable candidate was the firm of Anders and Hans Dedekam. They started in Arendal in 1797 and traded in timber. By 1830 they owned a number of vessels.
From November 1804 to June 1807 Kongen af Assianthe was registered at Arendal with U.P. Ugland, master. She apparently regularly sailed beyond Cape Finisterre.
Capture: During the run-up to the Gunboat War HMS Niobe and captured the Danish ship King of Assianthe on 31 August 1807. King of Assianthe, Ugland, master, was sold for ã479 10s 10d.