Nicola Pisano
During the 14th century the cathedral acquired an important relic, the "Sacra Cintola" or Belt of the Holy Virgin. This brought about the enlargement of the edifice by the addition of a transept which is attributed to Giovanni Pisano, but is probably the work of a pupil of Nicola Pisano. The Cintola Chapel was also built at this time to house the relic.