The Basilica of San Frediano is one of the oldest churches in Lucca, founded in the 6th century and rebuilt in the 12th century with a magnificent Byzantine mosaic on the façade — unusual in Tuscany and striking in contrast to the Pisan-Romanesque style of the city's other major churches. The interior has Romanesque columns, a remarkable Romanesque font from the 12th century, and several early frescoes.
In the right transept lies the mummified body of Saint Zita, displayed in a glass case as it has been since her death in 1272. Zita, a domestic servant who became venerated for her kindness to the poor, is one of Lucca's patron saints, and her naturally preserved remains have been an object of pilgrimage for over 700 years.