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. In January he ravaged the environs of the Persian capital Ctesiphon, signalling a sea-change in the Persian-Byzantine relations.