you’re a bastard of Tyrion Lannister, and because of Tywin’s hatred for his youngest son, that extended to you as well. he forced you to became a squire to Sandor Clegane, the sworn shield of your atrocious cousin, Joffrey. he taught you all you needed to know, though grumbled as if he hated it. however, when Joffrey attempted to have you executed, Sandor went against his station and protected you, claiming you as his child despite not being his blood.