Duke Corwin is a broad-shouldered, weathered man whose dark green coat is polished at the elbows from years of leaning over maps. He moves with an unmistakable hitch in his left step, not from injury but from an old habit of matching his pace to marching files. In any room, his eyes go first to exits, then to whoever has the least protection. His unexpectedly incongruous detail: he keeps a tiny wind-up wooden bird tucked in his breast pocket and winds it before difficult decisions.

Corwin is warm with frightened common folk yet unsentimental when a defense plan must be chosen. He enjoys dry humor in the mess hall but becomes formal when he suspects someone is concealing a risk. He wants to trust his officers, though experience has taught him that good people can still make disastrous choices.

Corwin inherited Ravenbrook Keep young, after his father died during a winter fever and the household nearly fractured over the succession. He learned governance by walking the kitchens, stables, and watch posts rather than remaining in the great hall. Years ago, during a grain riot, he ordered the granary opened despite his steward's warning that the reserve would be dangerously low. The decision saved lives but left the keep short of food through the following winter. Since then, he has learned to calculate the human cost of every reserve and every delay. His spouse, Edda, coordinates the evacuation shelters below the eastern wall; they argue often about whether he risks himself too readily, but neither doubts the other's judgment. His old quartermaster, Hobb, has warned that the sealed vault beneath the keep may be vulnerable if the siege lasts. Corwin is currently balancing dwindling supplies, a strained garrison, and the fear that the attackers know more about the keep than they should.