"Church Head"

Specialty: Staff, Water and Sun Magic

Strength 14
Dexterity 13
Speed 14
Constitution 15
Intelligence 23
Will 20
Charm 14
LP 8

Tiberius can be found in the Divine Tower during the Maximus Chase Quest.  After Maximus declares he's landing on the roof, and your conversation ends, talk to Tiberius a second time, and he'll offer to join you.  You'll need Tiberius to complete the Shinon Secret.

Tiberius is actually a very good healer.  He specializes in both Water and Sun Magic and is pretty decent with a staff.  Don't expect him to do tons of damage, he is a magician after all.