by ancient triumphal arches such as the Arch of Constantine and consists in a high-arched opening that is flanked by two shorter sidelights topped with lintels and supported by columns. From his days in Florence, Sansovino was likely familiar with the Serlian, having observed it in the tabernacle of the Merchants’ guild by Donatello and Michelozzo () on the façade of the Church of Orsanmichele. He would have undoubtedly seen Donato Bramante's tripartite window in the Sala Regia of the Vatican during his Roman sojourn and may have been aware of the sixteenth-century nymphaeum at Genazzano near Rome, attributed to Bramante, where the Serlian is placed in a series. At the Marciana, Sansovino adopted the contracted Serlian of the Orsanmichele prototype, which has narrow sidelights, but these are separated from the tall opening by double columns, placed one behind the other. This solution of the narrow sidelights ensured greater strength to the structural walls, which was necessary to balance the thrust of the barrel vault originally planned for the upper storey. Layered over the series of Serlians is a row of large Ionic columns. The capitals with the egg-and-dart motif in the echinus and flame palmettes and masks in the collar may have been directly inspired by the Temple of Saturn in Rome and perhaps by the Villa Medicea at Poggio a Caiano by Giuliano da Sangallo. For the bases, as a sign of his architectural erudition, Sansovino adopted the Ionic base as it had been directly observed and noted by Antonio da Sangallo the Younger and Baldassare Peruzzi in ancient ruins at Frascati. The idea of an ornate frieze above the columns with festoons alternating with window openings had already been used by Sansovino for the courtyard of Palazzo Gaddi in Rome (1519–1527). But the insertion of windows into a frieze had been pioneered even earlier by Bramante at Palazzo Caprini in Rome (1501–1510, demolished 1938) and employed in Peruzzi's early sixteenth-century Villa Farnesina. In the library, the specific pattern of the festoons with putti appears to be based on an early second-century sarcophagus fragment belonging to Cardinal Domenico Grimani's collection of antiquities. Ground floor The ground floor is modelled on the Theatre of Marcellus and the Colosseum in Rome. It consists in a succession of Doric columns supporting an entablature and is layered over a series of arches resting on pillars. The combination of columns layered over an