Catherine's story is the beating heart of this basilica. Much of her mystical journey unfolded here, and her relic, the mummified head, rests in her chapel. Her head came back to Siena in a notable way. In 1385 her confessor Raymond informed the Consistory of the Republic of Siena that the head was in the city. A solemn procession then set out from the church of San Lazzaro, outside Porta Romana, and moved to this basilica. The relic was enclosed in a copper bust, which is now kept in a case to the right of the chapel entrance. The art here follows her story. Andrea Vanni's fresco of the saint is held to be a true likeness of the Sienese saint, since Vanni was one of her disciples. In the Chapel of the Vaults hangs a canvas of the solemn moment on 29 June 1461, when Pope Pius II, Enea Silvio Piccolomini of Siena, blessed his nephew Francesco Piccolomini, archbishop of Siena, after handing him the papal bull of canonization. The painting was commissioned by the Piccolomini family for their altar in the Basilica of San Francesco and was moved here in 1890. Sodoma painted two famous scenes beside the altar, in 1526: the Ecstasy and the Fainting of Saint Catherine. Elsewhere, look for Francesco di Giorgio's Adoration of the Shepherds, one of the few paintings by an artist better known as an architect. In the left transept, a chapel houses the Maestà by Guido da Siena, mentor of Duccio di Boninsegna.