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The Klingon D7-Class Battle Cruiser was introduced in 2257 as part of Chancellor L'Rell's attempt to unify the warring Klingon houses. The new class of battle cruiser represented the state of art technology at the time of launch. It was designed to replace the different designs that had been used by the 24 Klingon houses in the previous decades and carried the symbol of the Empires rather than of any house. The D7 class served as the backbone of the Klingon fleet from the late 2250s through the 2270s, where they posed a serious threat to the security of the Federation and Starfleet.