D7 class

The D7 class battle cruiser was a type of warship designed and built by the Klingon Empire during the mid 23rd century. Many also entered the service of the Romulan Star Empire following the formation of a Klingon-Romulan alliance in the 2260s. 

History
The D7-class was the next step in Klingon battle cruiser design, its form being a development of the earlier D4 class. The first prototypes entered service as early as 2151

By the mid 23rd century the class had become the mainstay of the fleet. Following the formation of a Klingon-Romulan alliance in the 2260s, many D7s entered service in the Romulan Star Empire as Stormbird-class cruisers. (TOS episode: "The Enterprise Incident," FASA RPG: ''The Romulans: Star Fleet Intelligence Manual).

A variant of this cruiser was the D7-A, which saw use as early as 2269. (FASA RPG: Star Trek IV Sourcebook Update).

A significant class variant was the D7-M or K't'inga-class. (FASA RPG: Star Trek IV Sourcebook Update).

Variants
The D7 class name describes any number of variants of the class, which included many individually named and numbered series.
 * (battle cruiser)
 * (D7-D5)
 * ("Painbringer", D7A cruiser)
 * ("Bringer of Destiny", D7C cruiser)
 * ("Truthbringer", D7G cruiser)
 * ("Bringer of Destruction", D7M cruiser/battle cruiser)
 * ("Bringer of Agony", D7R cruiser)
 * ("Bringer of Justice", D7S cruiser)
 * (frigate)

The Romulan-owned D7s were referred to as vessels, and that class name seems to refer to multiple types listed above, most notably the Akif and K't'inga-classes.

D7c K't'agga-class




D7M K't'inga-class

 * IKV
 * (KL-1017)
 * (KL-1017)
 * (KL-1017)
 * (KL-1017)
 * (KL-1017)

K't'inga-class




Romulan starships (Stormbird-class)

 * IRV
 * IRV

Akif-class

 * IRV

D-7M K't'inga class

 * IRV
 * IRV
 * IRV
 * code-name Arakkab
 * code-name Kenek
 * code-name Ykir

K't'inga-class

 * RSE
 * RSE
 * RSE