The Formation of the Jedi Order

We unlike our brothers across the galaxy swear fealty to the Dark Angels Jedi, its ideals and its members. We will serve the force and our brothers until death takes us. Until we feel the warmth of the Force's embrace. - The Dark Angels Oath as spoken by Mutius Vos and Kavar Orion 167 ABY

It began with two
The Dark Angels Jedi Order is often thought to have been founded by Azreal a powerful jedi that taught the well known masters Mutius Vos and Kavar Orion. While this was the original intention, the order was founded by Azreals students Mutius Vos and Kavar Orion. They dedicated the founding to their master and even in their later years they continued to claim that he himself was the founder when in real terms Azreal died a decade or so before the founding.

The First Temple & Lineage
The first temple that housed the Dark angels jedi order is thought to have been on an unknown planet called Caliban in the outer rim, the order was still small and it was eventually forced to relocate to Dantooine, and then Coruscant due to the lack of funding. It was initiated as a major jedi order in the Galactic Alliance at the time Although due to its small size it was never asked to play a large role in the galaxy until later on in around 250 ABY. The Jedi order still continues to this day and while some may contest this it is still as strong as it ever was.