A project for an enlargement of the cathedral, in order to create a more luxurious seat for the Shroud, was launched in 1649, when Bernardino Quadri arrived in Turin from Rome at the court of Duke Charles Emmanuel II of Savoy. Quadri's design was based on a previous project by Carlo di Castellamonte, with an oval chapel behind the choir. In 1667 Guarino Guarini was called in to complete the project. The dome, whose works dragged for 28 years, was completed in 1694 under the direction of Marie Jeanne of Savoy, Charles Emmanuel II's widow.