Formerly called the the Mantinea Base. Picture shows one slab, the right hand one.

Three slabs from the base of a monument showing in relief Apollo and Artemis with their mother, Leto, on the right, the Muses on the left, and Marsyas the satyr playing his pipes in the middle. In this version of the myth, Marsyas must die for challenging Apollo to a music contest. To the left of Marsyas waits the Scythian slave with his knife, soon to be Marsyas’s executioner. Leto was a female Titan, not a goddess, but had a cult following in a number of places in ancient Greece.

This is thought to be an original late work by Praxiteles. It shows Praxitelean characteristics in the elaborate hairstyles and complex drapery of the Muses