Protector

Protector is a title used by several alien races. The term "protector" was also used by Droxine to describe the filter masks supplied by the USS Enterprise (NCC-1701) to the Ardanan Troglytes. 

Colyus (or at least the hologram based on him) was a Yaderan Protector. He became Protector in the early 2360s. 

Protector was a title given to leaders in Kelemane's species.