Siege of Vienna
(Sept 12, 1683) A battle between the Ottoman Empire lead by Grand Vizier Kara Mustafa against a coalition of Polish, German, and Austrian armies led by Jan Sobieski (who became John III). Following its defeat, the Ottoman Empire never again made further territorial incursions into Europe, and Austrian power increased. As such, it is considered an important turning point in relations between east and west, and between Christianity and Islam.