Two years later he was in Rimini, working for the condottiero Sigismondo Pandolfo Malatesta. In 1451, during that sojourn, he executed the famous fresco of "St. Sigismund and Sigismondo Pandolfo Malatesta" in the Tempio Malatestiano, as well as a portrait of Sigismondo. In Rimini, Piero may have met the famous Renaissance mathematician and architect Leon Battista Alberti, who had redesigned the Tempio Malatestiano, although it is known that Alberti directed the execution of his designs for the church by correspondence with his building supervisor. Thereafter Piero was active in Ancona, Pesaro and Bologna.