Cumae was founded by Ionians from Euboea around 750. Cumae had a Temple to Apollo and Sibyline oracle that channeled Apollo. In Greece, Apollo and its oracle became active in the eighth century. It wasn't a pan-Hellenic god, however, until after the Lelantine War (c. 720-650)
When was the Cumaean temple to Apollo created? Would it have been the religion of the founding Cumaeans, or did it come at a later date?
I will throw something more into the question for fun. What happened to the temple of Apollo in Oscan Cumae c. 421-338?