Rhadamanthus (also transliterated as Rhadamanthys or Rhadamanthos) in Greek mythology was a son of Zeus and Europa and brother of Minos, king of Crete and Sarpedon. He was raised by Asterion. He had two sons, Gortys and Erythrus.
According to one account Rhadamanthus ruled Crete before Minos, and gave the island an excellent code of laws, which the Spartans were believed to have copied.
According to later legends, on account of his inflexible integrity he was made one of the judges of the dead in the lower world, together with Aeacus and Minos. He was supposed to judge the souls of Asians, Aeacus those of Europeans, while Minos had the casting vote (Plato, Gorgias, 424A).
Virgil makes Rhadamanthus one of the judges and punishers of the damned in the Underworld (Tartarus) section of The Aeneid. "Rhadamanthine" has since come to describe any just but inflexible judgment. (The Aeneid, vi. 566)