Secesison is an artistic style that developed in the 19th century in Austria, Vienna. It is the style that is most evident in architecture, although it has left its mark in both painting and sculpture. At that time, a large number of artists studied in Vienna, the capital of the Austro-Hungarian monarchy in that time, among whom was Kamilo Tončić. This thesis follows the great architect and builder from Split, Kamilo Tončić. The chapters describe his works and his influence and contribution to the city of Split. After studying, he decided to decorate Split with several magnificent buildings in the seccession style. He completely designed the building of the Sulfur Spa, the Croatian Home and his private villa. He also participated in numerous renovations and alterations to buildings. He left a great influence on the culture of the city, not only with architectural works but with the founding of museums, the organization of events. He founded the Crafts School, the Ethnographic Museum and the Art Gallery. He was one of the organizers of an important exhibition of the First Dalmatian Art Exhibition in Split in 1908, and participated in the founding of various art groups. Occasionally he was privately engaged in painting and noting ornamental folk patterns.