Possible Clues:

• He's well in a month
• Golden Fleece hunter
• Argonauts' skipper
• Greek hero, captain of the Argo
• Argo pilot
• Hero of Apollonius's 'Argonautica'
• & nineteen across It enabled Dire Straits to stroll up the charts
• His color is red
• He was George on "Seinfeld"
• Name spelled by the first letters of consecutive calendar months