Caballine is a centaur who works in PPTV, and is a sculptor for a gallery. She is Foaly's wife, and a big fan of some of Foaly's inventions, namely the Mood Blanket, made specifically for centaurs. Caballine usually jogs with Foaly every evening.
Caballine was only mentioned in The Lost Colony and The Time Paradox. It is revealed in The Time Paradox that she married Foaly during the 3 years Artemis and Holly were gone, she discourages Foaly from taking another wife, though it is custom for centaurs to do so. Her name may be a reference to the Spanish word caballo, which means "horse".
Holly Short is a good friend of Caballine, and they meet regularly at the spa.
In The Atlantis Complex, it is mentioned that she is a mother. Therefore she and Foaly have kids.