Kronan, also called Stora Kronan, was a Swedish warship that served as the flagship of the Swedish navy in the Baltic Sea in the 1670s. When built, she was one of the largest seagoing vessels in the world. The construction of Kronan lasted from 1668 to 1672 and was delayed by difficulties with financing and conflicts between the shipwright Francis Sheldon and the Swedish admiralty. After four years of service, the ship foundered in rough weather at the Battle of Öland on 1 June 1676: while making a sharp turn under too much sail she capsized, and the gunpowder magazine ignited and blew off most of the bow structure.