My perfect Rome is fluid, migrating every few hundred years as needed.
First Rome- based out of Rome (founding-476)
Second Rome- based out of Constantinople (476-717)
Third Rome- based out of Antioch (717-907)
Fourth Rome- based out of Persepolis (907-1225)
Fifth Rome- based out of Delhi (1225-1389)
Sixth Rome- based out of Bengal (1389-1526)
Seventh Rome- based out of Ayutthaya (1526-1765)
Eight Rome- based out of Guangzhou (1765-1842)
Ninth Rome- based out of San Fransisco (1843-1906)
Tenth Rome- based out of New York (1906-1929)
Eleventh Rome- based out of Lisbon (1929-1970)
Twelfth Rome- based out of Rome (1970-present)
No one understands how they've maintained legal continuity across time, geography, and culture, but somehow they've managed.
They swear each move made sense at the time.