Halopedia: Timeline is an official Halopedia page which lists out timeline of the Halo franchise. This page is simply a reference for general events. For detailed information, please refer to the Timeline template provided on the right.
 The timeline
 Forerunner era
Expanding from 200,000 BCE to 40,000 BCE, the Forerunner Era covers events such as the rise of the spacefaring prehistoric human civilization, Forerunner-Flood War, activation of the Halo Array, and the depopulation of the galaxy.
 Rise of the Covenant era
The Rise of the Covenant Era composed of events starting from 50,000 BCE to 1500 CE. The era includes the San 'Shyuum Civil War, Sangheili-San 'Shyuum War, formation of the Covenant Empire, assimilation of species under the Covenant, and early human history (such as the Battle of Thermopylae).
 Globalization era
The Globalization era showcases events from the 1500 CE to 2170 CE such as the pre- and early industralized human history, formations of key nations and empires, the First and Second World Wars, formation of the United Nations, the Cold War, modern history (i.e. i love bees), early human space colonies, battles and skirmishes of the Interplanetary War, the formations of the Unified Earth Government and the United Nations Space Command.
 Colonial and Insurrection era
The Colonial and Insurrection era includes events spanning from 2170 CE to 2525 CE. The era includes the Odyssey mission, early human colonization of the Inner Colonies, UNSC operations against the Rebel/Insurrection forces in the Outer Colonies and the ORION Project (SPARTAN-I).
 The Great War era
The Great War era focuses on the events from 2525 CE to 2553 CE. Such events covered under this era are the Human-Covenant War, the Great Schism, minor rebel conflicts, Flood outbreaks and Forerunner events.
 Post-war era
The post-war era covers events taking place after the end of the Human-Covenant War. This includes the reconstruction of UEG colonies, the continuation of the Great Schism, the conflicts on Requiem and the re-awakening of the Ur-Didact leading to a resurgence of Forerunner activity in the galaxy.