Captain Key

Captain Key is a plot item and key in Dragon Age: Origins.

Acquisition
Can be looted or stolen (Master Stealing required) from the Mercenary Captain in South Wing of Bann Franderel's Estate during The Tears of Andraste quest.

Involvement
This key unlocks the door which leads to the exterior of the estate and also the door which leads to the cellar. Both doors can also be picked for 40 and 50 XP respectively.