Pisswater Prince

Pisswater prince is the name that Tyrion Lannister gives the tanner’s son from Pisswater Bend who was swapped with Prince Aegon Targaryen when he was an infant. His mother died birthing him and his father sold him to Lord Varys for a jug of Arbor gold - he had other sons but had never tasted Arbor gold. Varys gave the pisswater prince to Elia Martell and carried Aegon away for his own safety.