Images of saints have been of huge importance in the entire history of humanity. It was useful for the church to have and spread such portraits due to the fact that they encouraged people to follow the ideals, to believe that these personalities were direct messengers of God on earth. In the article the author presents how images of saints were painted in fact using portraits of various periods as examples. Also, he analyses portraits of the most important saint of Lithuania – Saint Casimir (1458 – 1484) and compares them to images of the French king, Saint Ludwig IX (1214 – 1270).