水戶藩
was a western-style sail frigate, constructed on orders the Tokugawa shogunate of Bakumatsu period Japan by Mito Domain in response to the Perry Expedition and increasing incursions of foreign warships into Japanese territorial waters. She was built from 1854 to 1856 on land adjacent to Mito Domain’s Edo residence at a site which later became IHI Shipyards, i.e. Ishikawajima island, at the mouth of the Sumida River, in Tokyo,