There has been at least one thread with discussion of the seemingly redundent title of Klingon Imperial Empire.
https://www.trekbbs.com/threads/the-klingon-imperial-empire.277384
Some people don't think that it is redundent to write about an imperial empire.
https://www.quora.com/Did-the-Imperial-Japanese-Empire-ever-win-battles-against-the-American-Empire
Possibly there is some connection with the movie title mentioned in an earlier post.
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I think what Ronald D. Moore may have had in mind here by adding the seemingly redundant word "Imperial" to Klingon Empire was a nod to what the Japanese called their empire: Dai Nippon Teikoku, literally Greater Japanese Empire.
There was an infamous Japanese WWII film released in 1982 with that exact title (Dai Nippon Teikoku) which was a defense of Japanese Imperialism. The U.S. title was translated as The Imperial Japanese Empire. It's just a guess on my part, but it's certainly within the realm of possibility that Moore thought of this film (or the translation) while writing the teleplay for "Sins of the Father."
https://www.trekbbs.com/threads/the-klingon-imperial-empire.277384
Some people don't think that it is redundent to write about an imperial empire.
https://www.quora.com/Did-the-Imperial-Japanese-Empire-ever-win-battles-against-the-American-Empire
Possibly there is some connection with the movie title mentioned in an earlier post.
↑
I think what Ronald D. Moore may have had in mind here by adding the seemingly redundant word "Imperial" to Klingon Empire was a nod to what the Japanese called their empire: Dai Nippon Teikoku, literally Greater Japanese Empire.
There was an infamous Japanese WWII film released in 1982 with that exact title (Dai Nippon Teikoku) which was a defense of Japanese Imperialism. The U.S. title was translated as The Imperial Japanese Empire. It's just a guess on my part, but it's certainly within the realm of possibility that Moore thought of this film (or the translation) while writing the teleplay for "Sins of the Father."