A Venetian window (also known as a Serlian window) is a large tripartite window which is a key element in Palladian architecture. Although Sebastiano Serlio (1475–1554) did not invent it, the window features largely in the work of the Italian architect Andrea Palladio (1508–1580) and is almost a trademark of his early career. The true Palladian window is an elaborated version. Overview The Venetian window consists of an arched central light, symmetrically flanked by two shorter sidelights. Each sidelight is flanked by two columns or pilasters and topped by a small entablature. The entablatures serve as imposts supporting the semicircular arch that tops the central light. In the library at Venice, Sansovino varied the design by substituting columns for the two inner pilasters. To describe its origin as being either Palladian or Venetian is not accurate; the motif was first used by Donato Bramante and later mentioned by Serlio in his seven-volume architectural book Tutte l'opere d'architettura et prospetiva expounding the ideals of Vitruvius and Roman architecture, this arched window is flanked by two lower rectangular openings, a motif that first appeared in the triumphal arches of ancient Rome. Palladio used the motif extensively, most notably in the arcades of the Basilica Palladiana in Vicenza. It is also a feature of his entrance to Villa Forni Cerato. It is perhaps this extensive use of the motif in the Veneto that has given the window its alternative name of the Venetian window; it is also known as a Serlian window. Whatever the name or the origin, this form of window has probably become one of the most enduring features of Palladio's work seen in the later architectural styles evolved from Palladianism. According to James Lees-Milne, its first appearance in Britain was in the remodeled wings of Burlington House, London, where the immediate source was actually in Inigo Jones's designs for Whitehall Palace rather than drawn from Palladio himself. Palladian window The Palladian window or "Palladio motif" is Palladio's elaboration of this, normally used in a series. It places a larger or giant order in between each window, and doubles the small columns supporting the side lintels, placing the second column behind rather than beside the first. This is introduced in the Basilica Palladiana in Vicenza, where it is used on both storeys; this feature was less often copied. Here the openings are not strictly windows, as they enclose a loggia. Pilasters