St. Theresa of Calcutta

Mother Teresa's name is synonymous with peace, not only in the kind and gentle words she used, but also in her actions to help those in need. She was rewarded with the Nobel Peace Prize in 1979 for all her work with the most vulnerable members of society.

St. John Paul II

The much-loved pontiff had an instrumental role in ending the communist regime in his homeland of Poland and the rest of Europe. His wise words on World Peace Day in 1995 stressed the importance of ending war and conflict: it was time for words that spoke to the hearts of all. He was a man of peace who saw war as a defeat for humanity.

St. John XXIII

This earlier pontiff's motto was Oboedientia et Pax (Obedience and Peace). Before becoming pope he used his role in the Church to intervene in many ways and save thousands of Jews during WWII. During his time as pontiff he also wrote the encyclical Pacem in Terris (Peace on Earth).

St. Martin de Porres

The illegitimate, mixed-race Peruvian grew up in extreme poverty and had one desire, to join a religious order -- something that was impossible back then due to his race. However, he volunteered at a religious community and for years carried out menial tasks. His efforts were recognized and he was finally allowed to join the order, although he underwent bullying by others. He led a devout and holy life helping those in need.

St. Catherine of Siena

This 14th-century Italian religious' faith in God paved the way for her to live a life dedicated to serving others while fighting for peace. Despite being illiterate, she managed to dictate powerful letters to state and Church leaders in a bid to unify the Church and Italy during political unrest. Her efforts worked, as she managed to persuade the pope to return to Italy from France, where he'd sought safety.