Duke Horacio

Duke Horacio is the ruler of Lumbridge and the surrounding area. His duties include ruling Lumbridge. He hands out Anti-fire shields to players during the Dragon Slayer quest. Using the option "I seek a shield to protect me from dragonbreath." the player can achieve an unlimited supply of shields - using the drop method.

Another way to get Anti-fire shields is to buy from Oziach for 26 gold, with a total stock of 35.

He lives on the 2nd floor of the Lumbridge Castle in a room with a quest marker in it.