Topic: Imperial vs. imperial
I've run into another round of capitalization issues that I need help with. I've been capitalizing the term Imperial throughout my book. I've been treating Imperium/Imperial as comparable to Canada/Candian. Pretty much no other resource I've checked capitalizes imperial, except as part of a proper noun (e.g., Imperial Rome). I've now run into a situation where Imperial should definitely be lowercase, so I'm abandoning capitalization of the word, which raises the following cases:
1. A small imperial fleet is approaching. (Lowercase.)
2. The entire Imperial Fleet is approaching. (Proper noun.)
3. The Imperial Perimiter is off limits. (Proper noun.)
4. The Imperial Colloseum collapsed. (Proper noun.)
5. The Imperials are attacking. (???)
6. The imperial admiral is approaching. (Lowercase.)
7. It was Imperial Admiral Gaius Lupus who attacked. (I'm treating Imperial as a formal part of his title, hence caps.)
8. The imperial palace was attacked. (??? Not sure exactly if "imperial palace" should be caps. It strikes me as odd that Imperial Perimeter would be capitalized, but not imperial palace.)
9. The imperial family was attacked. (??? Same question as imperial palace.)
10. His chest was emblazoned with the imperial emblem. (??? Same question. Wikipedia refers to Britain's coat of arms as either the Royal coat of arms or the Royal Arms. Other sources write it as Britain's Coat of Arms.)
11. The Imperial Classiarii attacked. (??? Classiarii is Latin for marines. Not sure if Imperial should be capitalized here or not. I assume it comes down to whether imperial and Classiarii form a proper noun. If I do capitalize it, doesn't that suggest that imperial family, imperial palace, and imperial emblem also be caps? If I take that to a ridiculous extreme, I'll end up with things like Imperial Farts. Where does the use of proper nouns begin and end?)
Thanks!