Matthias Flacius Illyricus (Latin; Croatian Matija Vlačić Ilirik, German Matthias Flach) (March 3, 1520-March 11, 1575) was a Lutheran reformer. He was born in Carpano, a part of Albona (today Labin) in Istria, son of Andrea Vlacich alias Francovich and Jacobea Luciani, daughter of a wealthy and powerful Albonian family. His mother's uncle was the Lutheran Baldo Lupetina who later was condemned to death in Venice for his faith. His polemics have usually been passed over as distasteful by church historians; however he stands at the beginning of the scientific study of church history. Regardless of Flacius's polemic intent, the correction of bad history and bad exegesis has been valuable to persons of many faith and non-faith traditions. Hence the continuing value of the principles embodied in Flacius' Catalogus testium veritatis (1556; revised edition by J. C. Dietericus, 1672) and his Clavis scripturae sacrae (1567), followed by his Glossa compendiaria in N. Testamentum (1570). His characteristic formula, historia est fundamentum doctrinae, is better understood now than in his own day.