平へい城じょう宮きゅうMeanings1nounHeijō Palacehistorical termHistorical term for the imperial palace in the Nara-period capital Heijō-kyō (modern Nara).See also: 平城京平へい城じょう宮きゅうは奈な良ら時じ代だいの天皇てんのうの住すまいでした。Heijō Palace was the residence of the emperor during the Nara period.