The topic of Marian theology throughout the history of the Catholic Church represents a significant and complex area of theological research. This thesis focuses on a specific aspect of Marian theology through the work of Father Ante Antić, a prominent Franciscan theologian and writer. The first chapter of the thesis addresses the life and work of Father Ante Antić, examining his roles as an educator, confessor, and leader. The second chapter is dedicated to the analysis of "Letters to Laypeople" by Father Ante Antić, with a particular emphasis on three key themes: Mary as a mediator of grace, Mary as a helper in faith, and Mary as an example of love for one's neighbor. These themes are explored within the context of Antić's theology, highlighting how his written messages have shaped the understanding of Mary's role in the spiritual life of laypeople. The third chapter of the thesis compares Father Ante Antić's Mariology with pre-Vatican II theology. Pre-Vatican II Mariology, which developed from early Christianity to the Second Vatican Council (1962-1965), focused on dogmatic assertions about Mary, including her Immaculate Conception, Assumption, and her role in salvation. This theology emphasized Mary's special connection with Christ and her mediation. Through his work, Father Ante Antić 35 significantly influenced the understanding of these dogmas, offering a profound and impactful interpretation of Marian theology that aligns with pre-Vatican II viewpoints. His deep devotion and dedication to Mary provide a valuable contribution to the understanding and interpretation of Marian theology within the context of pre-Vatican II theology.