Republic of Venice Venice, at one with the sea, was being born. Agnello was succeeded by his son Giustiniano, who stole the remains of Saint Mark the Evangelist from Alexandria, took them to Venice, and made him the republic's patron saint. According to tradition, Saint Mark was the founder of the Patriarchate of Aquileia. With the patriarch's flight to Grado after the Lombard invasion, the patriarchate split into two: one on the mainland, under the control of the Lomabrds and later the Franks, and the other in Grado on the lagoons and the areas under Byzantine control; this would later become the Patriarchate
Saint Isaac's Square granite pedestals; they were made famous by Pushkin in his last long poem, "The Bronze Horseman". Nearby is Quarenghi's Horse Guards' Riding Hall (1804–07), in part inspired by the Parthenon and flanked by the marble statues of the Dioscuri, by Paolo Triscornia. Opposite the cathedral is the Mariinsky Palace, built in 1829-1844 for Grand Duchess Maria Nikolayevna. Currently the palace houses the Saint Petersburg Legislative Assembly. In front of the palace is the 97-metre-wide Blue Bridge, which used to be the widest in Saint Petersburg. Spanning the Moika River, the bridge is usually perceived as the extension of the square,