John XXIII was pope from 1958-1963. Despite being elected as a “caretaker” pope, he called the Second Vatican council, which greatly shaped the Church that Catholics know today.
John Paul II was pope from 1978-2005. He was pope when I became Catholic in 2004. His charismatic presentation of the faith, along with his fidelity to Apostolic Teaching played a big role in my becoming Catholic.
Saints John XXIII and John Paul II, ora pro nobis.