Helmasaur King

The Helmasaur King, known in the Lizalfos language as Jeakrock, was a large Helmasaur that came to be worshipped by the Lizalfos as their God of Beasts.

Ancient Age
The Helmasaur King lived on Death Mountain circa 5000 BG, where it was a constant warzone between the Volvagians, Gorons, Lizalfos, Dodongos, Helmasaurs and many other species; and it was probably during this period that the Lizalfos came to worship the Helmasaur King as a deity of beasts. After the rise of Dakkon, who united Death Mountain under the Volvagians and enslaved the Gorons, the Lizalfos and the Helmasaurs were driven south to the Faron Woods.

Rise of Ganon
As of 1 BG, the Helmasaur King has not been seen in ages - it's most likely that he was dead or long gone.