Thetis, knowing that her son Achilles was doomed to perish, if he went to the Trojan war, privately sent him, it is said, to the court of Lycomedes, where he was disguised in a female dress; but, as Troy could not be taken without him, Ulysses went to the same court in the habit of a merchant, and exposed jewels and arms for sale. Achilles, neglecting the jewels, generally more attractive to female eyes, and displaying a certain skill in handling the weapons, inadvertently discovered his sex, and, challenged by Ulysses, was obliged to go to the war, in which he ultimately perished. The truth of this story cannot perhaps be safely asserted, especially as the introduction of the goddess Thetis is evidently poetical; but the tradition of it and the two following are quoted, to show that such impostures and concealments were not considered derogatory to the courage or good conduct of the greatest heroes of antiquity; and it is also probable that such facts, stripped of their poetical dress, did really take place. Ulysses had pretended to be insane, that he might not be obliged to leave his beloved Penelope; and had yoked a horse and bull together, ploughing the sea-shore, where he sowed salt instead of corn. This dissimulation was discovered by Palamedes, who placed Telemachus, the infant son of Ulysses, before the plough, and thus convinced the world that the father was not mad; as he turned the plough from the furrow, to avoid injuring his son. Codrus, the last king of Athens, from a nobler motive concealed his dignity, and saved his country, by sacrificing his own life; for, when the Heraclidæ made war against Athens, the Delphian oracle was consulted about the event: the Pythoness declared, that the Peloponnesians would be victorious, provided they did not kill the Athenian king. This response being promulgated, Codrus, in the heroic spirit of the age, determined to sacrifice his own life for the benefit of his country. Disguising himself, therefore, as a peasant, he went to the outpost of the enemy, and, seeking an occasion to quarrel, he was killed. When the real quality of the person slain became known, the Heraclidæ, believing their fate sealed if they remained, quickly retreated to their own country.