Brahma on a turtle with the four Lokapalas.
From left to right: Varuna on a horse, Kubera with a lion, Yama with a bull, and Indra with an elephant.
You can read more about the Lokapalas at Wikipedia, and also about Brahma.
(Wikimedia: Sri Lanka, 9th century; the object is in the Metropolitan Museum of Art, but no image at their website.)
Some detailed images: