The Minbari are the oldest of the younger races and were influenced by the Vorlons in their early history.
In 1260 the Minbari joined forces with the Vorlons to fight the Shadows.
There followed a long period of peace until contact was made with Humans in 2245 which led by accident to a 3 year war.
There were internal conflicts in Minbar in 2261, but they were resolved and the Minbari Federation joined the Interstellar Alliance.
Minbari technology is highly advanced, and only exceeded by the Vorlons and Shadows.