Sebastian Maggi was born in Brescia to nobles in 1414. He is related to Bishop Berardo Maggi who was also the Duke and Count of Brescia.^[3]

Maggi began his work in 1429 when he joined the Order of Preachers. His intelligence was noticed and he later received a master's degree in theological studies. He rose through the ranks and became the superior of several religious Dominican houses. He practiced corporal mortification and was strict in discipline. He would often tell his subordinates: "When you have committed a fault, come to me, not as prior, but as your father. If you will not have me as a father, you will find me a severe judge."^[4]

He appointed the monk Girolamo Savonarola to the position of novice master and set that famous Florentine friar on his own path to fame.^[4] In his time he was regarded as one of the greatest preachers in the Italian state.

Pope Alexander VI chose Father Maggi to investigate revelations that Savonarola claimed were given to him directly from God. Savonarola appealed the choice and believed that Sebastian - as Vicar-General of the Lombard Congregation - would be biased and try to take over his recently emancipated "San Marco" facility in Florence. Alexander VI, however, had already decided to give the facility back to the Congregation, making Sebastian Savonarola's canonical superior.^[5]

He died in 1496. He is buried at the Dominican "Santa Maria di Castello" complex in Genoa. In 1963 his remains were still found to be incorrupt.

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