(sometimes Paccioli or Paciolo; c. 1447 – 19 June 1517)[3] was an Italian mathematician, Franciscan friar, collaborator with Leonardo da Vinci, and an early contributor to the field now known as accounting.

In 1499, Pacioli and Leonardo were forced to flee Milan when Louis XII of France seized the city and drove out their patron.

[5] Pacioli published several works on mathematics, including: The majority of the second volume of Summa de arithmetica, geometria.

The third volume of Pacioli's Divina proportione was an Italian translation of Piero della Francesca's Latin book De quinque corporibus regularibus.

"[11] The ICAEW Library's rare book collection at Chartered Accountants' Hall holds the complete published works of Luca Pacioli.

Sections of two of Pacioli's books, 'Summa de arithmetica' and 'Divina proportione' can be viewed online using Turning the Pages, an interactive tool developed by the British Library.

Long thought to have been lost, a surviving manuscript was rediscovered in 2006, in the 22,000-volume library of Count Guglielmo Coronini-Cronberg in Gorizia.