Ernest Casimir's Hat with a Bullet Hole Hat or Ernst Casimir I Ernst Casimir or Nassau-Dietz's hat with a bullet hole Hat; with bullet hole; that Ernst Casimir wore during the siege of Roermond; Yellow-gray felt hat with wide edge. A round hole above the edge. Hoed; who wore Ernst Casimir during the siege of Roermond. Ernst Casimir was killed on 2 June 1632 during the siege of Roermond. He was fatally hit by a bullet in the head; Roermond; Ernst Casimir count of Nassau-Dietz; anonymous; in or before 1632; felt (textile); h 16.0 cm x d 45.5 cm