From the online Encyclopaedia Britannica:
Piero della Francesca, original name
Piero di Benedetto dei Franceschi
(born c. 1416/17, Sansepolcro, Republic of Florence [Italy]—
died Oct. 12, 1492, Sansepolcro),
painter whose serene, disciplined exploration of perspective
had little influence on his contemporaries but came to be
recognized in the 20th century as a major contribution to
the Italian Renaissance. The fresco cycle “The Legend of
the True Cross” (1452–66) and the diptych portrait of
Federico da Montefeltro, duke of Urbino, and his consort
(1465) are among his best known works.