The Klingon Imperial Court was the legal body of the Klingon Empire. Rumors among the Klingon people said that descendants of Kahless the Unforgettable himself sat on the court.
In 2375, General Martok, being from a common background, spoke of the hardship he had endured to reach his current position of prominence in the Klingon Empire. In comparison, he noted those descended from the Imperial Court were more likely to join the "elite officer ranks". (DS9: "Once More Unto the Breach")