He and his twin sister Artemis, a virgin huntress no less deadly with the bow, were famed for their sensitivity to insult. When a king’s daughter named Niobe boasted of how many more children she had than Leto, the mother of Apollo and Artemis, who had only ever had the two, the twin gods exacted a terrible vengeance. A firestorm of golden arrows felled her sons and daughters. For nine days their corpses lay unburied in their mother’s hall, caked with blood.