WH40K Canon Timeline of the Galaxy

Introduction
In this page, you will find a description of many major events of each era that makes the Warhammer 40.000 History. Those events are of great importance to the factions of which you Homebrews are part of, and as such, some of them will definitly have a great impact over the story of your characters and factions.

Note : All the dates are meant to be the most precise possible, but many of them were lost through history, or are even contradictory between many sources. The writer made his best effort to provide the most precise Timeline possible.

Any fan of the Warhammer 40.000 Universe knows the history of the lore, but remember that it is not the case of your characters. Only a fraction of the Inquisition knows of events such as the War in Heaven or the Fall of the Aeldari, thanks to the obscurism of the Imperium that tries his best to hide intels and events to its warriors and population. Such informations would mean nothing for a General of the Astra Militarum or a Commander of the Fire Cast. As well, an Overlord of a Necron Dynasty wouldn't know of the Horus Heresy, considering his people were slumbering in their Tomb World when this event happend. When writing a Homebrew, a Character or playing a Roleplay, you must be sure that your characters logically knows of particular events.

The Ancient Times : From the Birth of the Universe to Humanities's expansion through the Stars.
Note : Those times are lost to even the most ancient species of the Galaxy, and no precise records of the events that transpired still exist.