Star Trek The Next Generation, book 61 : Diplomatic Implausibility
Keith R. A. DeCandido2001

200 YEARS AGO : The expanding Klingon Empire found a frozen world rich in deposits of the mineral topaline. They named the planet taD - Klingon for "frozen" - and they called the people jeghpu'wI' - conquered.

FOUR YEARS AGO: The Klingon Empire invaded Cardassia, breaching the Khitomer Accords and causing a break with the Federation. On taD, depleted Klingon forces were overthrown in a small coup d'état, and the victorious rebels took advantage of the disruption to appeal for recognition from the Federation.

NOW: The Klingons have returned to taD and re-established their control. But the stubborn rebels insist on Federation recognition. A solution to the diplomatic impasse must be found, a task that falls to the Federation's new ambassador to the Klingon Empire - Worf.