The Argonauts were a group of heroes in Greek mythology who accompanied Jason on his quest to retrieve the Golden Fleece. They traveled aboard a ship called the Argo, which was built by Argus and was said to be the first ship ever constructed. The crew included famous figures such as Hercules, Orpheus, and Atalanta. Their journey took them to various lands, facing numerous challenges and adventures, including encounters with mythical creatures and treacherous seas. The story of the Argonauts highlights themes of bravery, friendship, and the pursuit of glory in ancient Greek culture.