Balthazar was the name of a high priest of the church of the Triune during the time of the Sin War novels. The other two high priests at the time were Malic, high priest of Mefis, and Herodius. It is never explicitly stated whether he was the high priest of Bala or Dialon, but seeing as Balthazar means "Baal protects the King" in Phoenician, it seems likely that he was the high priest of Bala.
Both he and Herodeus are only mentioned by name once in the books, and play no part in the plot at all.
- Birthright, page 156. Richard A. Knaak, 2006.