Stefano was also a coward. Despite having copious amounts of cunning and treachery, the priest lacked the virtue of loyalty. He decided to run while Francesco fought alongside his more courageous guards. More evidence of this was his choice to hide in a monastery, a place of holiness and of God, believing that the Assassin would have no ability to strike there. Although this plan showed wit and strategic planning, it also displayed signs of cowardice and naivety.
Stefano's white hair was receding to the point of non-existence at the time of his death, leaving a lightly freckled scalp open to the air. His skin was deeply wrinkled with frown lines and age, hands thickly veined. His eyes were light brown and deep-set into his skull, his brow protruding. Stefano's robes were dark brown and inexpensive, typical of a Renaissance priest. They extended to drape the top of his boots, just long enough to make fast pacing difficult. The top of the robes included a large hood, in which Stefano could hide his face from the public. The priest was tall and unbowed from age, though drastically thin.
- Historically, Stefano da Bagnone was a priest who tried to kill Lorenzo de' Medici. He found refuge with monks, but was arrested on May 3, 1478. His nose and ears were cut off, and he was hanged from the Palazzo della Signoria tower.
- He is initially shown to be an atheist through his inclusion into the Templar Order, and his open claims that God did not exist, but he was actually unsure of the truth as shown in his final words.
- When Ezio was about to ask the monks in Forlì about Savonarola, they fled from Ezio because he killed Stefano, claiming that "the killer of monks has returned."
- Before his death, Stefano is seen talking to a devoutly Christian monk. However, once Stefano was assassinated, the monk would try to kill Ezio.