Luca Pacioli, was a Franciscan friar born in Borgo San Sepolcro in what is now Northern Italy in 1446 or 1447. It is believed that he died in the same town on 19 June 1517. He is best remembered for his 615-page mathematical compendium, Summa de Arithmetica Geometria Proportioni et Proportionalità, published in 1494; and for his friendship with Leonardo
