The Amphion was the personal pleasure craft of king Gustav III of Sweden. It was designed by Fredrik Henrik af Chapman, a famous 18th-century Swedish ship engineer, built at Djurgårdsvarvet in Stockholm in the summer of 1778, and launched the same year. Amphion, named after Zeus' son and culture patron in Greek mythology, served as a royal yacht and headquarters ship. The ship was essentially a modified turuma, a type of shallow-draught frigate that served in the Swedish archipelago fleet. It was equipped with oars to allow it maneuverability of a galley while retaining a broadside of heavy guns and a full rig. It was equivalent to similar "archipelago frigates" of the archipelago fleet, but at Gustav III's request it was built without heavy cannons and therefore differed significantly fro