What was the name of the Japanese flagship during the Battle of Tsushima? (currently a museum ship in Yokosuka)

Mikasa is a pre-dreadnought battleship built for the Imperial Japanese Navy. After 1922, Mikasa was decommissioned in accordance with the Washington Naval Treaty and preserved as a museum ship at Yokosuka. Mikasa is the last remaining example of a pre-dreadnought battleship anywhere in the world.