The Khanid Kingdom, also known as the Dark Amarr, was founded a few centuries ago when the last Amarr Emperor was chosen. Khanid was one of the royal heirs at the time and, in accordance with tradition, should have killed himself after failing to become emperor. This Khanid refused to do and split his vast domains from the Amarr Empire.
The empire retaliated, but only managed to conquer some of the vulnerable outer regions from Khanid. The Kingdom still upholds many of the traditions of Amarr society, but has also wholeheartedly embraced the customs of others, mainly the Caldari. Many visitors to the Kingdom feel like it is a surreal mix of the Amarr and Caldari empires.