a Renaissance style. The Basilica has a Latin cross layout with a nave and two aisles, a transept and a rectangular apse. It includes a 9th-century baptismal font. The nave fresco decoration was completed in the 16th century by Bernardino Lanzani. The 15th-century crypt houses the sarcophagus of St. Columbanus, by Giovanni dei Patriarchi (1480), and those of the first two abbots, St. Attala and St. Bertulf. Also in the crypt is a 12th-century pavement mosaic with the histories of the Maccabeans and the Cycle of the Months. No structures of the earliest monastery buildings are visible. The bell-tower (late 9th century) and the smaller apse are from the original Romanesque edifice. The Torre del Comune (Communal Tower) was built in 1456–85. The Museum of the Abbey includes findings and remains from Roman (tombs, altars, sculptures) and Lombard ages (capitals, tombstones). It houses also a polyptych by Bernardino Luini and the Bobbio collection, the second largest in the world, of Monza ampullae, pilgrimage flasks from the 6th century. Library The nucleus of the abbey's library may have been formed by the manuscripts which Columbanus had brought from Ireland (though these must have been exceedingly few) and the treatises which he wrote himself. The learned Saint Dungal (d. after 827) bequeathed to the abbey his valuable library, consisting of some 27 volumes. A late 9th-century catalogue, published by Lodovico Antonio Muratori (but now superseded by the edition of M. Tosi), shows that at that period every branch of knowledge, divine and human, was represented in this library. The catalogue lists more than 600 volumes. Many of the books have been lost, the rest have long since been dispersed and are still reckoned among the chief treasures of the later collections which possess them. In 1616 Cardinal Federico Borromeo took for the Ambrosian Library of Milan eighty-six volumes, including the famous "Bobbio Orosius", the "Antiphonary of Bangor", and the Bobbio Jerome, a palimpsest of Ulfilas' Gothic version of the Bible. Twenty-six volumes were given, in 1618, to Pope Paul V for the Vatican Library. Many others were sent to Turin, where, besides those in the Royal Archives, there were seventy-one in the University Library until the disastrous fire of 26 January 1904. Gerbert of Aurillac (afterwards Pope Sylvester II) became abbot of Bobbio in 982, and with the aid of the numerous ancient treatises he found there, composed his celebrated work on