During the time that Odysseus and his men were at Circe's island, Calchus, the king of nearby kingdom, fell in love with Circe and tried his best to win her affections to no avail, as she was in love with Odysseus. He would not stop visiting, however, irritating Circe. So she set a trap for him; she invited him over for dinner, but the food she offered him was enchanted with magical herbs, and consuming it drove him insane. After some time, his army arrived on the island looking for him, and Circe released Calchus and gave him over to his men, after making him swear he would never set foot on Aeaea again.