HMS Wivern (1863)
 The first HMS Wivern was an ironclad turret ship built at Birkenhead England one of two sister ships secretly ordered from the John Laird Sons & Company shipyard by the Confederate States of America in 1862. Her true ownership was concealed by the fiction that she was being constructed as the Egyptian warship El Monassir. She was to have been named Mississippi upon delivery to the Confederates.