Canon houses are clergy buildings located within the precinct of a catherdal belonging to the canons (from Latin:canonicus). The oldest preserved canon houses date back to the 16th/17th century. The canons formed together the so called Poznan cathedral chapter ( Latin: capitulum). Its tradition goes back to the 10th century. It consisted among others of : provost (chairman), dean (overseeing the discipline of the clergy), curator (responsible for chapter’s wealth), cantor (oversees the choir), scholastic (teaching and preaching). They are obligated to provide spiritual services at the cathedral but most importantly to help the bishop in a difficult process of running the cathedral. It was quite a challenge taking into account the fact that up untill the 18th century the Poznan diocese belonged to the largest ones in the country.