Ignjat Alojzije is a representative of the third generation of the Brlić family in Brod na Savi, today's Slavonski Brod. He played a significant role in the Brod's cultural life, so this paper will present a fragment of Brlić's cultural activities. Although he was a merchant by profession, Ignjat Alojzije Brlić occupied himself with translation, literature and linguistics in his leisure time. Brlić's linguistic work belongs to the time of the Croatian national revival and continues directly on the Slavonian grammatical tradition of Tadijanović, Reljković and Lanosović. Brlić's main linguistic work is Grammatik der Illyrischen Sprache (1833). This paper will introduce the structure of Brlić grammar, with an emphasis on Brlić's description of word class and the description of noun declination types. Brlić was an ardent supporter of the Illyrian movement, but when it came to the linguistic endeavors, attitudes and solutions of the Zagreb Illyrians, he was very critical. His thoughts on linguistics were much closer to the Zadar School of Philology's linguistic and orthographic endeavors. According to Brlić, in this paper the biggest mistakes made by the Zagreb Illyrians and Brlić’s alternatives to these mistakes are presented.