When the Georgians ironically referred to the Emperor as "the goat," hinting at his incestuous marriage, Heraclius recalled a passage from the Book of Daniel about the two-horned ram overthrown by the one-horned goat. He interpreted this as a good sign and struck southward against Persia. On 12 December 627 he appeared on the bank of the Tigris and clashed with Persian forces near the ruins of Nineveh.