 Bishop Luigi Maria Marelli (1915–1936) held the thirty-fourth diocesan synod on 20–22 August 1923.In 2007, the diocese opened its 37th Diocesan Synod, a gathering dedicated to addressing problems and opportunities confronting parishes in the 21st century.The Council of Trent, in its 23rd Session, meeting on 15 July 1563, issued a decree, the 18th chapter of which required that every diocese have a seminary for the training of clergy.