Sometime between then and 1414 Antonio moved to Florence, where he wrote a motet, O felix flos Florencia/Gaude felix Dominice, in honor of the city of Florence and Leonardo Dati, the new Dominican Master General, who was elected on 29 September of that year . In 1420 he probably went to Rome along with Pope Martin V, who had recently been elected by the Council of Constance; Clarus ortus/Gloriosa matera a motet written in Martin V's honor in 1421, is probably by Antonio .
Sometime between then and 1414 Antonio shifted his residence to Florence, where he penned a motet, O felix flos Florencia/Gaude felix Dominice, as an expression of admiration for the city of Florence and Leonardo Dati, who had been elected Dominican Master General in September 1414. In 1420, Antonio probably joined Pope Martin V on his journey to Rome; Clarus ortus/Gloriosa matera a motet written in honor of Martin V in 1421 is likely attributed to Antonio.