|Book(s)||A Dance with Dragons (appears)|
Duncan wears his worldly wealth upon his person and a lord's ransom in golden arm rings. Each ring signifies one year's service with the Golden Company.
Duncan is a Westerosi exile. His surname Strong is of a house that had once loomed large in the histories of the Seven Kingdoms. He may or may not be of House Strong, as in the free companies a man can call himself whatever he chooses. He may be related to another serjeant in the company, Denys Strong.