Popular name for a wine of the vintage 1529 from Wien (Austria). The name is derived from the (unsuccessful) first major siege of the Habsburg Empire's capital city by the Turks, which took place in that year. The wines of the vintage were extremely acid and for this reason almost undrinkable and were also contemptuously called "Wiedertäufer" (Anabaptists) after the radical Reformation Christian movement. An equally extremely sour wine from Wien of the 1443 vintage was called Reifbeißer. See also under sour wine and special wines.