Franjo Rački (25 November 1828 – 13 February 1894) was a Croatian historian, politician, writer, and Catholic priest.

Cirilla i Methoda slavjamkih apošlolov (The Age and Activities of Saints Cyril and Methodius, the Apostles among the Slavs).

There, he attended the Pontifical Croatian College of St. Jerome for three years, studying the history of South Slavic heretics (Glagolitics, Bogomils and Patarens).

[3] In the book, Rački founded the "Bogomil hypothesis", saying that the Bosnian Church was influenced by the dualist heretic teachings from Bulgaria, originating in the 9th century.

In addition to his work on the Bogomils, he also wrote Povjesnik Ivan Lučić (The Historian Joannes Lucius), Nutarnje stanje Hrvatske prije XII.

He was a key founder of the Yugoslavian Academy of Sciences and Arts and greatly contributed to the expansion of the University of Zagreb.

[2] Rački founded most editions of the Academy, which are published even today: Rad, Starine, and the Codex diplomaticus Regni Croatiae, Dalmatiae et Slavoniae, an exceptional monument of legal history.