Historical term for the era when the capital was in Heian-kyō (modern Kyoto). Often used in historical or literary contexts.
See also: 平安時代 (へいあんじだい)
The culture of the Heian period flourished around the aristocracy.
imperial court in the Heian period
Refers specifically to the court and its society, not just the time span. Often used when discussing court life, politics, or literature.
At the Heian court, waka poetry was considered an important cultural accomplishment.