Statue of a Nereid or Aura on horseback. Pentelic marble. Found at Epidauros. This was the right corner akroterion on the  west pediment of the temple of Asklepios. The goddess is depicted on horseback rising from the Ocean. By the sculptor Timotheos. About 380 BC.
<bdi><a href="https://en.wikipedia.org/wiki/en:Timotheus_(sculptor)" class="extiw" title="w:en:Timotheus (sculptor)"><span title="Greek sculptor of the 4th century BC">Timotheos</span></a>
</bdi>
CC BY 2.5
Marsyas