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The Timeline of the Halo universe spans hundreds of thousands of years, and is divided into several different eras for ease of understanding.

ErasEdit

Forerunner eraEdit

Spanning from 200,000 BCE to 50,000 BCE, the Forerunner Era covers the time during which the Forerunner Ecumene was the dominant power on the Milky Way galaxy. This era covers events such as the rise of the space-faring prehistoric human civilization, the Forerunner-Flood war, the activation of the Halo Array, and the subsequent depopulation of the galaxy.

Rise of the Covenant eraEdit

The Rise of the Covenant Era is composed of events starting from 50,000 BCE to 1500 CE, during which time the Covenant was first founded and expanded into a large interstellar empire. The era includes the San'Shyuum Civil War, Sangheili-San'Shyuum war, formation of the Covenant Empire, assimilation of several species into the Covenant, and some early human history (such as the Battle of Thermopylae).

Globalization eraEdit

The Globalization era contains events from 1500 CE to 2170 CE, such as the Industrial Revolution, formations of key nations and empires, the First and Second World Wars, formation of the United Nations, the Cold War, early human space exploration, modern history (including portions of i love bees), early human space colonies, the Interplanetary War and finally, the formation of the Unified Earth Government and the United Nations Space Command.

Colonial and Insurrection eraEdit

The Colonial and Insurrection era includes events spanning from 2170 CE to 2525 CE. The era includes the creation of the Shaw-Fujikawa Translight Engine, 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.

The Great War eraEdit

The Great War era focuses on the events from 2525 CE to 2552 CE, the years during which the Human-Covenant war was fought. Every battle in the Human-Covenant war, as well as the Great Schism and some minor rebel conflicts, fall within this era.

Post-war eraEdit

The Post War era occurs between the Great War Era and the Reclaimer Eras. It is composed of events that took place after the death of the Prophet of Truth in 2552, up until the discovery of the Ur-Didact by John-117 in 2557.

Reclaimer eraEdit

The Reclaimer era began with the discovery of the Ur-Didact's Cryptum during the First Battle of Requiem in 2557, and the UNSC's first encounter a Forerunner that followed. This era contains other events such as the Reclamation and the Second Battle of Installation 00.