Leopoldstadt of the main train stations at which migrants from other parts of the empire arrived in Vienna. The high number of Jewish inhabitants led to the area being called "Mazzesinsel" ("Island of Matzo", referring to the unleavened bread eaten during Passover). Several important synagogues were located there, including the Schiff Shul, the Leopoldstädter Tempel, the Türkischer Tempel, the Polnische Schul, and the Pazmanitentempel, as well as yeshivas. None of the synagogues escaped the destruction during the "Kristallnacht" pogroms of November 1938 following the annexation of Austria by Nazi Germany. A fragment of a Torah scroll was saved by Heschel Messias
Matzo for the Eucharist are flat, unleavened bread. The main reason for the use of this bread is the belief, that because the last supper was described in the Synoptic Gospels as a passover meal, the unleavened matzo bread was used by Jesus when he held it up and said "this is my body". All Byzantine Rite churches use leavened bread for the Eucharist as this symbolizes the risen Christ. Some Oriental Orthodox and Eastern Catholic Christians use leavened bread, as in the east there is the tradition, based upon the gospel of John, that leavened bread was on the table