Does anyone know of a SciFi "Universe" where humans have expanded across hundreds/thousands of stellar systems, but the empire has collapsed? Furthermore, the human occupied worlds fall to various levels of technology? Where most don't know what caused the collapse, and some aren't even aware of their past? Some people still have interstellar travel, but some that do don't understand how it works. Some have interplanetary travel and some have fallen to a preindustrial level.
I know Isaac Asimov's Foundation series is somewhat similar. I've been ruminating/developing a scifi universe that could be used for both rpg and writing purposes, and I thought "this has to have been done before". My sister told me it sounds similar to the tv series Andromeda, but after reading about that series, it doesn't sound quite like what I'm thinking of. Somewhat similar, but not exactly. But I've never really watched that show.
Requirements: 1. A far future human stellar empire(federation, hegemony, whatever). 2. It collapses and fragments. 3. At least 100-200 years pass. 4. The remnants are left at varying tech levels. 5. (Bonus) Some remnants have lost their history.
I want to create this "universe" as a story telling vehicle that could also be used as a game playing setting. I've given it some thought over the last few years, but I've become hung up by the fear that my idea is probably not very original, or just too close to someone else's. So, I'm trying to find out if anyone else has used a "universe" that matches almost all of those requirements.
But does it really matter if others have? I'll read up on everyone's suggestions. Thank You in advance!