Erin the Silver merchant, runs the Ardougne Silver Stall in East Ardougne. He plays a fairly large part in the Making Historyquest. The enchanted key is obtained from Erin during and after the quest; it is used in a miniquest to obtain the god Mjolnir weapons. He sells silver bar, silver ore, and unstrung Holy symbols of Saradomin. Holy Symbols are 200 coins each, the others are not restocked and so are rarely in stock.
Players with 50+ thieving can steal from his silver stall. Failure will result in Erin calling for a guard and you will not be able to buy anything from him any more for a certain amount of time.