Hulo was a kobold who traveled along with the most recent owners of the The Conventide Arcanum; Cormin Cherryseeker, Vezurz Flare and Hulo himself.
They found it ~100 years ago, and only had it for about 2 months before getting rid of it in order to avoid being relentlessly pursued by those who wanted the Arcanum for themselves. When they left the Arcanum, Hulo kept a few pages, just like Cormin did- a set of schematics.
Hulo is long dead, most kobolds not living very long. His only living descendant is Muulo Jr..