=Hy´dra.= A celebrated monster which infested the neighborhood of Lake Lerna in Peloponnesus. It was one of the labors of Hercules to destroy the monster, which he effected with the aid of Iolas. =Hyge´ia.= The goddess of health, daughter of Æsculapius. She was held in great veneration among the ancients. =Hymenæ´us= or =Hy´men=, the god of marriage among the Greeks, was the son of Bacchus and Venus, or, according to some, of Apollo and one of the Muses. =Hymet´tus.= A mountain of Attica, about two miles from Athens, famous for its bees and honey. =Hyperi´on.= A son of Coelus and Terra, who married Thea. Aurora was their daughter. Hyperion is often used by the poets to signify the sun. Also in "Troilus and Cressida" and other of Shakspeare's plays, the same license is used. =Hypermnes´tra.= One of the Danaides, who were the fifty daughters of Danaus. She was ordered by her father to murder her husband Lynceus on the night of their marriage, which she refused to do. Danaus wished to punish her for her disobedience, but afterwards forgave her, and left his kingdom at his death to Lynceus. =Hypsip´yle.= A queen of Lemnos, daughter of Thoas. During her reign, Venus, whose altars had been slighted, punished the Lemnian women by causing their husbands' affections to be estranged from them. This enraged the women, and they put to death their male relations, except in the case of Hypsipyle, who spared her father Thoas. =Ic´arus.= A son of Daedalus, who, with his father, took a winged flight from Crete to escape the anger of Minos. His flight was too high, and thus the sun melted the wax which cemented his wings, and he fell into the sea and was drowned. =Idom´eneus= succeeded his father Deucalion on the throne of Crete, and accompanied the Greeks to the Trojan war, during which he rendered himself famous for his valor. On his voyage home, being caught in a great tempest, he vowed to Neptune that if he escaped he would make an offering to the god of the first living creature he saw on his arrival at the Cretan shore. He escaped the storm, and the first to meet him on his landing was his son. He performed his vow, and became so odious to his subjects that he had to leave his dominions. =Igna´tius.= A bishop of Antioch, torn to pieces by lions in the amphitheater at Rome A.D. 107. His works consisted of letters to the Ephesians, Romans, etc. He zealously supported the doctrine of the divinity of Christ. =I´lus=, fourth king of Troy, was son of Tros by Callirrhoe. He married Eurydice, the daughter of Adrastus. He embellished the city of Ilium, called also Troy from his father Tros. =I´no.= A daughter of Cadmus and Harmonia, who nursed Bacchus. She married Athamas, king of Thebes, after he had divorced Nephele.