Word: Jovial - Where does it come from?

Jovial adj [jo-vi-al] endowed with or characterised by a hearty joyous humour or spirit of good-fellowship. 

The word can be first observed in the 1580's meaning love for the God Jupiter, who is also known as Jove and is the Roman God of the sky. The modern meaning is derived from it being believed that being born under the sign of Jupiter would give you such dispositions.