Certainly Pacioli become acquainted with the duke of Urbino at some time during this period. Pope Sixtus IV had made Federico da Montefeltro the duke of Urbino in 1474 and Pacioli seems to have spent some time as a tutor to Federico's son Guidobaldo who was to become the last ruling Montefeltro when his father died in 1482.
Papa Lungsod ng Baguio ay ginawa Federico da Montefeltro ang duke ng Urbino sa 1474 at Pacioli tila may nagastos ng ilang panahon bilang isang propesor sa Federico's anak na lalaki Guidobaldo na maging ang huling naghaharing Montefeltro kapag namatay ang kanyang ama sa 1482.