Upon arrival of Josip Juraj Strossmayer at the forefront of the Đakovo diocese in 1849 there started the construction of a new cathedral. For the construction purposes its main architect Karl Rösner made four projects with differences in the room arrangement and in the size of the cathedral. The last project was the foundation for construction. When the main architect died in 1869, there came Friedrich Schmidt who changed the front and the interior of the cathedral in order to achieve a perfect symmetry. When the main architect Schmidt finished major work in 1882, the construction was continued and finished by Herman Bollé. The entire furniture and fittings date from the 19th century. The cathedral is adorned by the main altar which is devoted to Saint Peter, seven collateral altars, a keyboard instrument called organ, liturgical items and wall frescoes. There were planned forty-four wall frescoes, but the painters Friedrich Overback, Aleksander Maximilian and Ludovic Seitz, who were a father and a son, painted in total sixty-six wall frescoes. The cathedral is not only richly decorated inside, but it is also richly decorated outside what is confirmed by majolica on the front side of the cathedral. The cathedral was being built from 1866 to 1882 and three worldwide famous architects worked on its construction among whom Friedrich Schmidt had the greatest influence as he worked longest on it.