Gryphon

Gryphon was a mountainous planet with an indigenous species who lived in clans and were constantly at war with each other. Brock Lar was one such individual, though he left the planet when his youngest son died.

Behind the scenes
Gryphon was created by Matthew Berry and Craig Farr, two Star Wars fans, for the backstory of their Brock Lar entry in the Design An Alien contest held in the Star Wars Galaxy Magazines and as such, exactly how canon the item is remains unclear.