What is "eobasileus"

Eobasileus cornutus ("Crowned Dawn-King") is an extinct species of dinocerate mammal. Eobasileus was long and stood tall at the shoulder; and with a weight up to 4000 kg (8818 lbs) it was the largest Uintathere. It looked very similar to the related Uintatherium. Like Uintatherium, it had three pairs of blunt horns on its skull, possibly covered with skin like the ossicones of a giraffe. The frontal pair may have been composed of keratin, like the horn(s) of a rhinoceros. Eobasileus also had a pair of tusks which were shielded by bony protrusions of the lower jaw.