"Pope Pius III (29 May 1439 – 18 October 1503), born Francesco Todeschini Piccolomini, was head of the Catholic Church and ruler of the Papal States from 22 September 1503 to his death. He had one of the shortest pontificates in papal history.
The nephew of Pope Pius II, his uncle appointed the twenty-one-year old Francesco as Archbishop of Siena. He served as papal legate in a number of places. In 1503, the frail, now Cardinal Piccolomini was elected pope as a compromise candidate between the Borgia and della Rovere factions. Although he announced plans for reforms, he died less than a month later, possibly of poison." - (en.wikipedia.org 31.01.2020)
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