Author of the lamb with golden fleece?

The Lamb with the Golden Fleece is a central figure in Greek mythology, and its story is told in the epic poem "Jason and the Argonauts", traditionally attributed to Apollonius of Rhodes.

However, it's important to note that the myth itself predates Apollonius by centuries, and likely existed in oral form before being written down. So, while Apollonius is considered the author of the specific version of the story we know today, he wasn't the originator of the myth.