The Romulans using their newly acquired D7 class battle cruisers (The Enterprise Incident)

The Klingon-Romulan alliance was an alliance formed in the 23rd century between the Klingon Empire and Romulan Star Empire.


One of the aims of the alliance, spearheaded by the likes of Proconsul Merrok was for the two empires to work together to contain the Cardassian Union. (DS9 novel: A Stitch in Time)

Another outcome of the alliance was a technology exchange between the two empires, the Romulans gained advanced D7-class battle cruisers, whilst the Klingons were given cloaking devices (TOS episode: "The Enterprise Incident"; TOS movie: Star Trek III: The Search for Spock)

The next generation Klingon Bird-of-Prey, the B'rel-class incorporated Romulan designs, including of course, a cloaking device. (ST reference: Starship Spotter)

Alternate timeline

In an alternate reality where Doctor Noonien Soong's dream of wide spread acceptance of artificial life in the form of Soong-type androids, the Klingon-Romulan alliance was reformed when the House of Duras succeeded in winning the Klingon Civil War. This combined power worked against the United Federation of Planets. (TNG novel: Brave New World)

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