Way to unlock: You need to be in a relationship with Josephine, ask her about the details of her life.
Quest giver: Josephine (M12,7)
This quest requires you to be involved with Josephine. Find her at the Skyhold. The quest is started by initiating a conversation - you need to ask questions. Then, Josephine tells you about her crest, which she would like to see. The quest is very short and it only requires you to complete the: "Find the Old Montilyet crest", and go to Val Royeaux.
There, on the main square, you find a trader with a stall - Barnabus (M4,5a). In the last tab of the items for sale, you can find a crest that is 0 gold. Buy it and take it back to Josephine. This is where the quest ends.
There are no rewards for this quest.