Luca Pacioli (1445–1517), also known as Friar Luca dal Borgo, is said to be the "Father" of accountancy. He wrote a textbook in Latin called "Summa de arithmetica, geometrica, proportioni et proportionalita" ("Summa on arithmetic, geometry, proportions and proportionality", Venice 1494). This textbook was used in the abbaco schools in northern Italy. Sons of merchants and craftsmen were taught in these schools. This textbook was written about math. It has the first printed description of how merchants from Venice kept their accounts. Merchants from Venice used a system called the double-entry bookkeeping system.