Giacomo Barozzi da Vignola

Vignola's main works include:

• Villa Giulia for Pope Julius III, in Rome (1550‑1553). Here Vignola was working with Ammanati, who designed the nymphaeum and other garden features under the general direction of Vasari, with guidance from the knowledgeable pope and Michelangelo. A medal of 1553 shows Vignola's main villa substantially as it was completed, save for a pair of cupolas.
• Villa Farnese at Caprarola (1559–1573);
• Villa Lante at Bagnaia (1566 onwards), including the gardens and their water features and casini;
• Chiesa del Gesù, Rome, the mother church of the Jesuit order, which would become a source for Baroque church facades in the 17th century;
• Basilica of Santa Maria degli Angeli, Assisi (with Galeazzo Alessi);
• Church of Sant'Andrea in Via Flaminia, Rome, the first church to have an oval dome, which became a signature of the Baroque.
• Palazzo dei Banchi, Bologna
• Palazzo Farnese, Piacenza. This was a grandiose project of a vast palace on a scale paralleled only by the Vatican Palace in Italy; the rectangular plan is circa 111 metres by 88 metres. The actual construction, however, made up only less than a half of Vignola's original project and lacked many of the planned architectural features; missing elements include part of the exterior surrounding walls, the main façade, modelled on the ancient triumphal arch and with a large tower, and a theater in the large inner courtyard.

Cloister of the Pontifical University of Saint Thomas Aquinas, Angelicum

• The main courtyard of the Pontifical University of Saint Thomas Aquinas, Angelicum, formerly the convent of the Church of Santi Domenico e Sisto, is traditionally attributed to Vignola but completed after his death. Ten arches on the long sides and seven on the short are sustained by pilasters with Tuscan style ornamentation that rise from high plinths. A simple frieze with smooth triglyphs and metopes separates the lower from the upper levels.[4]

Like many other architects, Vignola submitted his plans for completing the facade of San Petronio, Bologna. Designs by Vignola, in company with Baldassare Peruzzi, Giulio Romano, Andrea Palladio and others furnished material for an exhibition in 2001[5]

Le due regole della prospettiva prattica, 1682

His two published books helped formulate the canon of classical architectural style. The earliest, Regola delli cinque ordini d'architettura ["Canon of the five orders of architecture"] (first published in 1562, probably in Rome), presented Vignola's practical system for constructing columns in the five classical orders (Tuscan, Doric, Ionic, Corinthian and Composite) utilising proportions which Vignola derived from his own measurements of classical Roman monuments.[6] The clarity and ease of use of Vignola's treatise caused it to become in succeeding centuries the most published book in architectural history.[7] Vignola's second treatise, Due regole della prospettiva pratica ["Two rules of practical perspective"], published posthumously with extensive commentary by the mathematician Ignazio Danti (Bologna 1583), favours one-point perspective rather than two-point methods such as the bifocal construction. Vignola presented— without theoretical obscurities— practical applications which could be understood by a prospective patron.[8]