The article analyzes a Missal (Padua, Biblioteca Capitolare, B 26) belonged to the Bishop of Padua Ildebrandino Conti (1319-1352) who, at his death, donated it to his cathedral. The style of the illuminations indicates that it was executed around 1319-1320, at about the time he was appointed bishop of Padua, at Avignon where Ildebrandino lived for a long time at the Papal court. Two different illuminators realized the many brush-decorated letters without figures: the Maestro Avignonese, who made many initials, is undoubtedly a refined French illuminator who works in the style of the illumination common in Avignon around 1320. Next to him, in some letters, worked an Italian master identifiable with the Maestro del Codice di san Giorgio that we know for his illuminations in some superb liturgical manuscripts realized for Cardinal Jacopo Stefaneschi in Avignon. The Ildebrandino Missal definitively confirms the activity of the illuminator at the Papal court in France and we regret that in the Ildebrandino Conti's manuscript some pages, that probably contained particularly valuable illuminations by the Maestro del Codice di san Giorgio's hand, have been lost.