In the early 12th century the cathedral was enlarged under the direction of architect Rainaldo, who increased the length of the nave by adding three bays consistent with the original style of Buscheto, enlarged the transept, and planned a new facade which was completed by workers under the direction of the sculptors Guglielmo and Biduino. The exact date of the work is unclear: according to some, the work was done right after the death of Buscheto about the year 1100, though others say it was done closer to 1140. In any case, work was finished in 1180, as documented by the date written on the bronze knockers made by Bonanno Pisano found on the main door.