Piero della Francesca
Piero della Francesca (Borgo San Sepolcro, ca. 1412 – Borgo San Sepolcro, October 12, 1492) was an Italian painter. In Florence the works of Donatello, Brunelleschi, Masaccio, and Fra Angelico, had a profound influence on his style.
One of the great artists of the early Italian Renaissance, Piero della Francesca painted religious works that are marked by their simple serenity and clarity. He was also interested in geometry and mathematics and was known for his contributions in these fields. 
His art was ample, monumental and rational, and represents one of the highest artistic ideals of the early Renaissance. The absolute mathematical rigour of his creations emphasises the abstract and iconic traits of his paintings and adds a powerful religious feeling to his masterpieces. 
- Progetto Piero della Francesca
- PIERO della FRANCESCA Web Gallery of Art, created by Emil Kren and Daniel Marx.
- Piero della Francesca