"The Bride of the Man-Horse" by Lord Dunsany

caracole: a half turn to left or right executed by a mounted horse (or, apparently, a centaur)

Clio: one of the seven muses, Clio is a daughter of Zeus and the Titaness Mnemosyne, and is known as "the Proclaimer", the glorifier and celebrator of history, great deeds, and accomplishments.

The picture used is an illustration by Sidney Sime in the 1912 edition of "The Book of Wonder".

To follow along: https://www.gutenberg.org/files/7477/7477-h/7477-h.htm#THE_BRIDE_OF_THE_MAN-HORSE