Triceratops

Triceratops is the name of a genus of herbivorous ceratopsid dinosaur that existed in the Late Cretaceous period in what is now North America. This genus was quadrapedal, with a large bony frill and three horns on its face (hence its name). There is debate as to which species belong in the genus, with two recognized.

The genus was first discovered in 1887, and subsequently classified in 1888 by paleontologist Othniel Marsh (who'd initially believed the fossil to be a prehistoric bison).

Triceratops in "The Green Buffalo"
In an 1890-expedition to Wyoming, John Bell Hatcher discovered fossils of what he thought were Triceratops. When he telegraphed his employer, Othniel Marsh, Marsh quickly realized that Hatcher's new fossils were not Triceratops, but something else entirely.

Triceratops in "Running of the Bulls"
The running of the bulls was an annual festival in the Astilian city of Amblona. A herd of the large animals would be released in the street, while people ran in front or along side them. Naturally, given their tremendous size and prominent horns, people were seriously injured or killed during this event.

The running itself was connected to Astilia's worship of the god Thimras, who had the head of a bull and the body of a person. A priest and his acolytes would bless the bulls the day before the run. On the day of the run, they would cover the people running from snout to tail in white paint, to show Thimras their purity.

After the run, bullfighters fought the biggest bulls to the death.