The "Master of the First Prayerbook of Maximilian" seems to have led the team of artists that produced the codex, which included the Master of James IV of Scotland (who some scholars identify with Gerard Horenbout, court artist to Margaret of Austria), who painted many of the historiated borders, the calendar, as well as the small miniatures in the Ferial Psalter, and the Master of the Prayerbooks of c. 1500 or an artist in his circle.