Ansbach’s questline is pretty much tied into Hornsent’s side mission. When you talk to Hornsent, the NPC will give you a map that reveals the location of some hidden Miquella Crosses.

This is an optional part of Sir Ansbach's quest, and plays a bit into the quest of another NPC, Hornsent. During the first half of the Shadow of the Erdtree DLC, Hornsent will give you a map ...