The Young controversial Pope tells the story of the beginning of the pontificate of Pius XIII, born Lenny Belardo. A complex and troubled character, so conservative in his choices that borders on obscurantism border, but full of compassion for the weak and poor. He is a man of great power, which is stubbornly resistant to members of the Vatican, indifferent to the implications of his authority. In the series, Belardo will face the loss of his close and constant fear of being abandoned even by God. However, he is not afraid to take millennial mission – to defend the God and the world they represent.