Temple of Beelzebub

In the box set of the 1st ed World of Greyhawk, there is a short adventure idea called "The Jungle of Lost Ships."

I had this island inhabited by the evil Sahuagin, who worship devils. There was a temple dedicated to Beelzebub in the centre of the island. If the PC's were captured, they were taken to the temple and thrown into pits for gladiatorial fights and if they survived, would eventually be sacrificed.

The inspiration for this illustration was that adventure.