Question: is gaius van baelsar dead?
Answer: The Shadowhunter reveals to Hien, Alisaie and the Warrior of Light that he is Gaius Baelsar, asserting that Gaius van Baelsar died in the Praetorium (the missing particle implying his defect from Garlemald, similarly to Cid Garlond, since particles depend on one's rank in the Garlean society).