noun
Heian-kyō; former name of Kyoto
Historical term for the capital city of Japan from 794 to 1869, now known as Kyoto.
平安京は794年に日本の首都として建設された。
Heian-kyō was built as the capital of Japan in 794.
Modern name for the city; 平安京 refers specifically to the historical capital during the Heian period.
From 平安 (Heian, the era name) + 京 (capital). The name was given when the capital was moved to this location in 794.