In reality, however, the capital was moved three years after Yakatsugu's death to Nagaoka-kyo and later to Heian-kyo, marking the decline of Heijo-kyo.
だが、現実には既に宅嗣の死から3年後に長岡京次いで平安京への遷都が行われ、平城京自体の荒廃が始まっていた。