15th-century Baltic warship served as a 'floating castle' for an intrepid king

A 15th-century royal warship resting off the coast of Sweden once served as a "floating castle" for an intrepid king, according to new underwater investigation that revealed cannons, handguns, crossbows and the vessel's stern superstructure. The new finds on the wreck of the Gribshunden — the flagship of King Hans (or John) of Denmark until it sank in 1495 — show the vessel plied the seas as a fearsome ship of war armed with dozens of guns and packed with soldiers.