Franjo Šeper (October 2, 1905—December 30, 1981) was a Croatian Cardinal of the Roman Catholic Church. He served as Prefect of the Congregation for the Doctrine of the Faith from 1968 to 1981, and was elevated to the cardinalate in 1965.
Matthias Flacius Illyricus (Latin; Croatian: Matija Vlačić Ilirik, German: Matthias Flach) (3 March 1520 – 11 March 1575) was a Lutheran reformer.
Saint Leopold Bogdan Mandić was born on May 12, 1866 and died on June 30, 1942. He was an ethnic Croat born in Herceg Novi, in Boka Kotorska (modern-day Montenegro), and died in Padua, Italy. Physically malformed and delicate, having a height of only 1.35m, with clumsy walk and stuttering, he developed tremendous spiritual strength. His feast is celebrated May 12.
Although he wanted to be a missionary in Eastern Europe, he spent almost all of his adult life in Italy, and lived in Padua from 1906 until the end of his life. He spent also one year in Italian prison during WWI, since he did not want to renounce his Croatian nationality. He also dreamed unceasingly about reuniting the Catholic and Orthodox churches and going to the Orient. He became known as Apostle of Confession and Apostle of Unity. He made a famous prayer that is the forerunner of today's Ecumenism.