855 BCE

The year 855 BCE is a year in the 850s BCE in the 9th century BCE.

Unknown

 * By this year, the Forerunner Dreadnought had been shot down on Suban during the San'Shyuum Reformists' attack on Sanghelios, and Breaking Shadow had led a coup against Pervading Stone, the leader of the Keepers of the Dawn, resulting in the San'Shyuum leader's assassination.