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The Klingon Third Dynasty was a period in Klingon history.
The Dark Time ended before the Klingon Third Dynasty. (DS9 episode: "You Are Cordially Invited")
The House of Mogh owned many pieces of weaponry dating from the Third Dynasty, which were sold after the House was dissolved by Chancellor Gowron in 2372. (ST - The Lost Era novel: The Art of the Impossible, KE novel: A Burning House)