Lonesome Gavlan:

Learn how to find and interact with Gavlan, the item vendor, in Dark Souls II: Scholar of the First Sin. Sell your unwanted gear and buy useful items.

You'll soon stumble across another building filled with pesky primate beasts. If you managed to activate the Pharros Contraption from earlier, the light will keep the beasts at a distance and you'll get a chance to kill them from afar. By the edge of the cliff, you'll discover a corpse that holds the Emit Force and Large Soul of a Lost Undead. Kill the incoming enemies and open the next room in the building.

Fall back since there are three more of those beasts inside and they can destroy the whole wall itself. After they've been dealt with, enter the room again and you'll have to kill another beast but on the second floor. Open the next door. In this room you'll find two chests, but one of them is trapped so quickly leave the room to avoid getting killed. You'll get two Silver Talismans from the trapped chest, and the Greatsword from the other one.

You'll meet Gavlan. He is the only person in the game to buy items from you. Make sure to sell all your unwanted belongings to him now, since after talking to him he'll change his location. You can also buy various poison and anti-poison items from him.