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
San Cassiano, Venice After being removed from Venice the altarpiece was split into a number of fragments. Only three of these were found and these are now in the Kunsthistorisches Museum in Vienna, Austria. The church also contains an early 18th-century painting of the "Martyrdom of San Cassiano" by Antonio Balestra. It depicts the saint being attacked by school children, an act which explains why Saint Cassian of Imola is the patron saint of school teachers. San Cassiano, Venice San Cassiano () is a 14th-century Roman Catholic church located in the San Polo "sestiere" of the Italian city of Venice. A church has