This is where he is mentioned in the story.
To make the princess cry was as impossible as to make her weigh. They sent for a professional beggar; commanded him to prepare his most touching oracle of woe; helped him out of the court charade-box, to whatever he wanted for dressing up, and promised great rewards in the event of his success. But it was all in vain. She listened to the mendicant artist's story, and gazed at his marvelous make-up, till she could contain herself no longer, and went into the most undignified contortions for relief, shrieking, positively screeching with laughter.
You meet the beggar on day one. He can become a good friend of the Prince and help him solve puzzles if he gets on his good side. The thing that I want to emphasize is that he is a professional. He supports his family by begging, so it's all about appearance. I want him to look really pathetic. His house is a pile of trash and junk covered with cow dung. He looks like he has sores on his legs and face. However, when you get on his good side, you realize that this is all a sham. He is family man. If you can force yourself to enter his house of dung, you notice that it is neat and nicely appointed inside, and the sweet wife and the smiling children greet him as he cries, "Hi honey, I'm home."