Who is Rhaegar Targaryen, and why does he matter? Who is Rhaegar Targaryen, and why does he matter? Who is Rhaegar Targaryen, and why does he matter? Who is Rhaegar Targaryen, and why does he matter? Who is Rhaegar Targaryen, and why does he matter? Who is Rhaegar Targaryen, and why does he matter?