Great Comet
The Great Comet of 1811 was interpreted by many in 1812 and later as a portent of Napoleon's invasion of Russia and is also often called Napoleon's Comet. The great comets that occurred during Napoleon's lifetime were those of 1769, 1771, 1783, 1807, 1811, and 1819 (and possibly other years depending upon the definition of “great comet”).