What is the name of the horse the USC Trojan rides?

The University of Southern California's official mascot is Traveler the white horse.

(The following is an excerpt taken from the official USC website. http://www.usctrojans.com/trads/usc-m-fb-mas.html)

Traveler, the noble white horse that appears at all USC home football games with a regal Trojan warrior astride, is one of the most famous college mascots.

Traveler first made an appearance at USC football games in 1961 (in the home opener versus Georgia Tech). Bob Jani, then USC's director of special events, and Eddie Tannenbaum, then a junior at USC, had spotted Richard Saukko riding his white horse, Traveler I, in the 1961 Rose Parade. They persuaded Saukko to ride his white horse around the Coliseum during USC games, serving as a mascot. Ever since, whenever USC scores, the band plays "Conquest" and Traveler gallops around the Coliseum.

The university its self got the nickname "Trojans" many years earlier, due to the fighting spirit of it's athletes in the face of superior colleges.