Emperor Shomu returned to the Heijo-kyo capital in 745, the following year after the transfer of the capital; however, Naniwa-kyo prospered as the second capital city (Baito) and as a port for a Japanese envoy travelling to the Tang Dynasty China.
聖武天皇は遷都の翌年745年に再び平城京に遷るが、その後も副都（陪都）として、また遣唐使の港として栄えた。