<human>:  Why did the Argonauts sail to the island of Colchis?
<bot>: The Argonauts sailed to Colchis to retrieve the Golden Fleece. The Golden Fleece was a magical object that could render whoever possessed it invisible. It was guarded by the dragon Ladon, who would only allow those who could defeat him to take it. The Argonauts were successful in their quest and brought the Golden Fleece back to Greece.