Naniwa-kyo
Osaka's ancient name, Naniwa, refers to the area's role as an early administrative and, at two separate points in the 7th and 8th centuries, imperial capital — first under Emperor Kotoku's Naniwa Palace around 645 CE, and again briefly under Emperor Shomu in the 740s, before the capital moved on to Nara and eventually Kyoto for the long term.
The palace ruins today
The Naniwa Palace site, a short walk from Osaka Castle Park, is preserved as an archaeological park with foundation markers outlining where the palace halls once stood — a quiet, easy-to-miss stop that gives a genuine sense of the site's age well before the castle that now dominates the same skyline.
Why it still shapes the city's identity
Osaka's status as an early capital and long-running trade hub — well before Edo (Tokyo) existed in any significant form — is part of why the city has historically carried its own sense of importance and rivalry within Japan, a thread that runs through everything from its dialect to its merchant-city food culture.