Lernaean Hydra that Hera placed the Hydra and crab as constellations in the night sky after Heracles slew him. When the sun is in the sign of Cancer (Latin for "The Crab"), the constellation Hydra has its head nearby. In fact, both constellations derived from the earlier Babylonian signs: Bashmu ("The Venomous Snake") and Alluttu ("The Crayfish"). Primary sources Secondary sources Lernaean Hydra The Lernaean Hydra or Hydra of Lerna (, "Lernaîa Hýdra"), more often known simply as the Hydra, is a serpentine water monster in Greek and Roman mythology. Its lair was the lake of Lerna in the Argolid, which was
Greek ironclad Hydra Greece ordered three new ironclads of the . "Hydra" was ordered from the "Ateliers et Chantiers de la Loire" shipyard in St. Nazaire, France during the premiership of Charilaos Trikoupis. The ship, named for the island of Hydra, was launched in 1889, and by 1892, she and her sister-ships "Spetsai" and "Psara" were delivered to the Greek fleet. The ship was long between perpendiculars and had a beam of and a mean draft of . She displaced as built. She was powered by a pair of steam engines of unknown type; they were rated at and provided a top speed