Brunelleschi’s churches in =Florence= include =S. Lorenzo= and =S. Spirito=, both of which are on a basilican plan, with elevations that involve modifications of Roman construction. The former is barrel vaulted in the Roman manner, but the nave ceiling of S. Spirito is of wood and flat. The dome of the latter is erected upon _pendentives_ which henceforth were employed on all Renaissance domes. Brunelleschi’s choicest ecclesiastical design, however, is the =Pazzi Chapel= in =S. Croce=--a dome over a square compartment, entered through a colonnade. He introduced columned arcades into cloisters and palace courts and used them also as features of the arcade in the =Loggia S. Paolo= and the =Ospedale degli Innocente= or Foundling Hospital. The two lower stories of the main front of the Pitti Palace were designed by Brunelleschi, who also carved the fine crucifix in the Santa Maria Novella. He died in 1446 and was buried in the Cathedral of Florence. =Michelozzo.=--Michelozzo, born in Florence in 1391, was the son of a tailor and became a pupil of Donatello. He worked in marble, bronze, and silver, one of the examples of his sculpture being the young S. John over the door of the cathedral. As an architect he enjoyed the friendship and patronage of Cosimo de’ Medici, for whom he built the =Riccardi Palace=, which was the earliest example of stately domestic architecture in Florence and proved a model for subsequent Tuscan palaces. During a temporary exile of his patron he accompanied him to Venice, where he designed the =Library of San Giorgio=. When in 1437 Cosimo bestowed the =Monastery of San Marco= on the Dominican monks of Fiesole, Michelozzo was employed to remodel it, erecting, among other features, the beautiful arcaded cloisters, which no doubt inspired the architectural details in Fra Angelico’s picture of “The Annunciation.” At his death, which appears to have occurred in 1472, he was buried in San Marco. =Alberti.=--Even in a higher degree than the two already mentioned, Alberti represented the versatility of the Renaissance, for besides being an architect he was also a painter, poet, philosopher, and musician. He was born in Venice in 1404 and at the age of twenty wrote a comedy in Latin verse, which in later years the publisher, Aldus Manutius II, printed under the impression that it was a genuine classic work. Alberti was appointed to a canonry in the Cathedral of Florence and there established a reputation for being the finest organist of his time. He wrote works on sculpture and painting but is most celebrated for his treatise on architecture, “De Re Ædificatoria,” which has been translated from the Latin into Italian, French, Spanish, and English. He was employed in Rome by Pope Nicholas V to restore the papal palace. At =Rimini= he was commissioned by Sigismondo Malatesta to remodel the =Church of S. Francisco=.