St. Mark's Basilica's exterior features Gothic crowning with aedicules, statues, and floral decorations by Tuscan artists. After the 1204 conquest of Constantinople, the lower body was covered with marble, while the upper part has wooden structures covered with sheet lead. The west facade has four 12th-century portals, including the main portal, a 13th-century masterpiece with sculpted Byzantine slabs. The south facade includes marble facings and columns, with the Tetrarchs porphyry sculpture on the corner. The north facade has 13th-century slabs near the gate of flowers and an elegant sculpture with a Nativity scene on top.
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The Gothic iconostasis in St. Mark's church is considered to be the most important of the three iconostases in the church. It replaced a 13th-century iconostasis and was created by the Venetian brothers Pierpaolo and Jacobello dalle Masegne in the late 14th century. It consists of 14 statues in white marble, including the 12 Apostles, the Virgin, and St. Mark. The figures are arranged in pairs, creating a rhythmical grouping. The iconostasis is in the style of a rood-screen, which is a traditional feature of Byzantine churches, but it is more correct to call it a "column transenna" as it lacks icons. The central part of the iconostasis bears an inscription with the date 1394 and the signatures of Pierpaolo and Jacobello dalle Masegne. The iconography of the figures is reminiscent of that of the iconostasis of the old St. Peter's church in Rome, and it is believed that the Venetians intended to compete with the church of the Apostle of Rome. The Gothic iconostasis is the only work in the church with the unquestioned signature of the Dalle Masegne brothers and is considered a significant example of their style.
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The ciborium, a 13th-century antique green marble structure, stands at the center of the sacred presbytery in St. Mark's Basilica. It is supported by four columns in oriental alabaster, adorned with bas-reliefs depicting scenes from the gospels. These have been subject to debate regarding their origin and date. The ciborium is an exceptional example of early Byzantine figurative sculpture, containing 108 scenes from the lives of Jesus Christ and the Virgin Mary. It reaches its maximum communicative value during celebrations in honor of Saint Mark when the Pala d'oro shines toward worshippers.
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Antonio Rizzo of Verona created the Renaissance altars of St. Paul and St. James in the north and south transepts, and the altar in the chapel of St. Clement, all commissioned by Doge Cristoforo Moro in the second half of the 15th century. The altars in St. Mark's Basilica are designed and decorated according to Renaissance forms and models. The altars of St. James and St. Paul have statues of the saints surrounded by Renaissance tabernacles. Rizzo was one of the first to use pilaster strips, trabeation, and a lunette in his altars.
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St. Mark’s church boasts over 500 columns and capitals, many of which were taken from Constantinople as spoils of war or created specifically for the church. The layout of the columns is characterized by strict symmetry and regularity, with the most beautiful and numerous being Byzantine works from the 6th to 11th centuries. The church also contains mediaeval copies of these Byzantine works, and careful attention was paid to the distribution of materials and forms. The resulting design creates a scene of great monumentality and beauty.
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Jacopo Sansovino was appointed as the director of works for St. Mark's Church in Venice in 1529, with the task of both consolidating and embellishing the building. He transformed the choir from medieval to Renaissance and created new benches with inlaid frontals. Sansovino's bronze reliefs of St. Mark's miraculous powers on the chorister tribunes were his most significant intervention, and influenced the works of Tintoretto. The bronze sacristy gate considered his masterpiece, depicts scenes of the Burial and Resurrection, framed by Prophets and Evangelists. Sansovino's sculptures in the presbytery are all in bronze, and he created a model in terracotta for approval before casting in bronze.
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