'The Young Pope' tells the controversial story of the beginning of PIUS XIII's Pontificate. Born Lenny Belardo, he is a complex and conflicted character, so conservative in his choices as to border on obscurantism, yet full of compassion towards the weak and poor. He is a man of great power who is stubbornly resistant to the Vatican courtiers, unconcerned with the implications to his authority. During the series, Belardo will face losing those closest to him and the constant fear of being abandoned, even by his God. He is, however, not afraid of undertaking the millennial mission of defending that same God and the world representing Him.