High Cleric
The High Clerics were a group on Boreth. 

The story of how the Sword of Kahless was forged was never written down and only known to the High Clerics, so that if Kahless returned, they could be sure it was Kahless. The knowledge was put to use when  appeared to have returned in 2369. ()

Background information 
In  Worf spoke of his conversations with the clerics of Boreth, while in "Rightful Heir" only the word "High Cleric" was used. Worf might have used cleric as shorthand, or clerics might be a lower rank. Similarly, in , Kor complained that the clerics of Boreth had cooked up a Kahless clone in a vat.

Furthermore, Koroth called himself one of the s, but also possessed knowledge said to be unique to the High Clerics.

In , the word  was used in relation to Boreth's inhabitants.
Religious titles