東はるの宮みやMeanings1nouncrown princeHistorical title for the crown prince in the Heian period, specifically the son of the emperor who resided in the Eastern Palace (東宮).東ひがしの宮みやは、平へい安あん時じ代だいの皇こう太たい子しの呼よび名なの一ひとつである。東の宮 is one of the titles for the crown prince in the Heian period.