Sempronius is rejected by Lanzoni, p. 324: "tarda e favolosa fonte." Kehr VIII, p. 373, also rejects Laberius and Sempronius: "moderni interpolatoris leves sunt inventiones." Giacomo Racioppi (1881), Fonti della storia basilicatese al medio evo. L'agiografia di san Laveri del MCLXII,(in Italian) (Roma: G. Barbèra), esp. pp. 7-12.
Antonio was the son of Jacopo de'Medici. A member of the Conventual Franciscans, he began to teach the "Sentences of Peter Lombard" in 1460, and in 1461 he was awarded the title of Magister and was incorporated into the University's theological faculty. He became its Dean in 1472. He served as superior in several convents of his Order, and was twice elected Provincial of the Tuscan province. On 12 July 1484, he was appointed Bishop of Marsico by Pope Sixtus IV, a fellow Franciscan. He died within a year, and was succeeded on 12 August 1485 by Fabricius Guarna. Luca Giuseppe Ceracchini, Fasti teologali ouuero notizie istoriche del collegio de' teologi della Sacra Vniuersità fiorentina dalla sua fondazione sino all'anno 1738. (in Italian) (Firenze: Ferdinando Moücke 1738), pp. 160-161. Servanzi-Collio, p. 29, no XLVII. Eubel III, p. 236
Christus Dominus 40. Therefore, in order to accomplish these aims this sacred synod decrees as follows: 1) The boundaries of ecclesiastical provinces are to be submitted to an early review and the rights and privileges of metropolitans are to be defined by new and suitable norms. 2) As a general rule all dioceses and other territorial divisions that are by law equivalent to dioceses should be attached to an ecclesiastical province. Therefore dioceses which are now directly subject to the Apostolic See and which are not united to any other are either to be brought together to form a new ecclesiastical province, if that be possible, or else attached to that province which is nearer or more convenient. They are to be made subject to the metropolitan jurisdiction of the bishop, in keeping with the norms of the common law. 3) Wherever advantageous, ecclesiastical provinces should be grouped into ecclesiastical regions for the structure of which juridical provision is to be made.
The bull Eo quod spirituales(in Latin), in: Acta Apostolicae Sedis 68 (1976), pp. 678-680.