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The Forerunners were sophisticated above all other empires and powerful almost beyond measure. Our Ecumene spanned three million fertile worlds. We had achieved the greatest heights of technology and physical knowledge, at least since the time of the Precursors...

The Ecumene was the formal name of the galaxy-spanning Forerunner empire which existed around 100,000 BCE and consisted of three million or more planets.[4]


Human-Forerunner war

Main article: Human-Forerunner war
This section requires expansion.

Forerunner-Flood war

Main article: Forerunner-Flood war
This section requires expansion.


This section requires expansion.


Natural Planets

Main article: Forerunner Planets

Artificial Constructs

The Ecumene had created a number of planetoid structures. One example of this would be the Shield World.

List of Constructs


  • "Ecumene" is a word describing the Earth as known by the classical civilizations of Greece and the Romans. This later became used by Christian denominations to refer to the general "Christian world."
  • Even though the Ecumene council could have numbered into the hundreds, there seems to be three main speakers; the Ur-Didact, The Librarian and Faber, who represent the Warrior-Servant caste, the Lifeworker caste and the Builder caste respectively. 
  • The Ecumene was mentioned to be extremely wealthy several times.[citation needed]



  1. Halo: Cryptum - Page 304
  2. Halo: Cryptum - Page 264
  3. Halo Waypoint: Universe - Forerunners
  4. 4.0 4.1 Halo: Cryptum - Page 9