context: Construction was started by the Doge Giustiniano Partecipazio in 829, and completed in 832 by his brother Doge Giovanni Partecipacio. Since the building of the first basilica has not been preserved, its appearance can only be judged by archaeological excavations carried out during the restoration of the crypt of the cathedral, when the ancient masonry of the walls was discovered. It is believed that the church was built in the form of a Latin basilica of the Ravenna type (San Vitale) and took the place of the current crypt [3]. The dome installed above its central part was located above the burial place of the relics of the Apostle Mark.
question: In what year was the Cathedral of the Holy Mark built?
answers.text: 832