Luca Pacioli, another famous mathematician and writer, was also born in Sansepolcro. He was a friend of Piero della Francesca, and used some of Piero’s ideas in a geometry book that he wrote called De Divina Proportione. Another friend, the famous Leonardo da Vinci, illustrated the book.
Luca Pacioli is most famous for his book of arithmetic and geometry that he wrote for students in schools in northern Italy. The book contains the first published account of double entry bookkeeping as used by Venetian merchants in the 15th century, which led Pacioli to be known as the Father of Accounting.
Luca Pacioli was born in Sansepolcro in 1447 and died there in 1517. The town remembers him with a statue, erected for the 500th anniversary of his birth.