The beggar is a teenage-looking boy located on a street corner near the town square in Emain Macha. He asks for gold. If you give him some, he will only take 1g at a time, though he tells you to not feel bad about giving him some more.
If you give him food, he will say that he "would like some more."
During Generation 2, one of your "Good Deeds" is to give the Beggar gold. You must first gift him 1 gold, then give him the 1,000 gold he asks for after.
During the Paladin Passive Defense Quest, Del and Delen remark that the Beggar has Page 3 of the Book of Paladin, however he will only offer the page for three four-star or higher T-Bone Steaks.