 HMS Agincourt , named after the victory at the Battle of Agincourt in 1415 , was originally ordered on 2 September 1861 as HMS Captain , but her name was changed during construction . She was laid down on 30 October 1861 by Laird 's at its shipyard in Birkenhead . The ship was launched on 27 March 1865 , commissioned in June 1868 for sea trials and completed on 19 December . The lengthy delay in completion was due to frequent changes in design details , and experiments with her armament and with her sailing rig . The ship cost a total of £ 483 @,@ 003 . 
