To kickstart discussion in this thread, I came up with the scenario below:
Observing the instability and rampant regionalism in Ethiopia upon coming to power, Zara Yaqob (or Emperor Constantine I) manages to successfully establish a centralized government but is faced with the issue of how to maintain the centralization of government around Debre Berhan. This leads to Zara Yaqob putting institutions in place to prevent Ethiopia from falling to the instability and regionalism that had been present prior to his centralization directives - this includes Zara Yaqob promulgating an edited Fetha Negast, a document that was to act as a de-facto Constitution in Ethiopia. The Fetha Negast codified his reforms, placed an emphasis on maintaining stability, checks-and-balances at the regional administrative level, established a merit-based aristocratic rank system (to phase out the Mesafint's dominance), etc. and came to act as a guiding hand in assisting his successor (whether that be Baeda Mariam I or Saga Amlak) in governing Ethiopia.
Thoughts? Criticism?