Aulis was a town in ancient Greece, located in the area of Boeotia, opposite the island of Euboea. In Greek mythology, the Greek fleet gathered there in order to set sail to Troy and bring back Helen. However, Agamemnon, one of the Greek leaders, had killed a sacred deer of Artemis, and the goddess, furious, had caused all winds to cease. In order to let the winds blow again, Artemis asked Agamemnon to sacrifice his daughter Iphigenia. Agamemnon eventually agreed to sacrifice his daughter; when Iphigenia was brought to the altar, though, she was secretly exchanged for a deer by Artemis, and the young lady was sent to the region of Tauris to serve as a priestess.