City of a Thousand Towers
Ivaso is a cleric of middle rank in the Phan merchant family. The party came across him in the first adventure (Angel Eyes followed him to the tavern as part of his attempt to get information on Linko, his assassination target).
Ivaso was wounded when the city golems attacked the demon-tainted people hiding in the tavern. On his unconscious body, Angel Eyes recovered the map that seems to have encrypted text on it and a diagram of two different floors of a tower (or towers).
Ivaso appears to strongly suspect the party has the map and has attempted to bribe Maria into returning it to him.