Origin

Star Trek Canon Special Note
Not everything listed in the origin is Canon.  That is because only television shows and movies are considered canon for Star Trek.  This being a comic website there are many things here that are not canon.  So unless it is contradicted in film it should be listed as part of the character biography.     
 
Tagok like his people are Vulcans who did not want to turn to a life of Logic.  Instead he they chose the warrior side and Tagok was a leader of his faction continually at war with other Vulcans on the same planet.  He almost had the upper-hand when he commandeered the Federation ship the U.S.S. Cortez.  Eventually his enemy killed him and everyone else with a doomsday weapon.

Creation

Tagok and his people were created for the comic series Star Trek Early Voyages.  They share a similar origin story with Romulans and other Vulcan off shoots.