Hana no Kage

Historical anime set in the Hein period + a few that feature Abe no Senmei.

The Heian era marked the height of Japan’s initial imperial aristocracy. With a strong focus on the arts, poetry, and literature; it cultivated the rise of samurai skilled in both aesthetics and battle. The Heian period essentially set the stage for the eventual shogunate and feudal period. Although seen as a rather peaceful era, it was actually rife with not all-out battles, but rather intrigue and power grabs behinds the scenes by the country’s most powerful and influential families; namely the Fujiwara, Genji (Minamoto), and Heike (Taira) clans.

Pulled from various online lists, if there is some anime that you known wasn't actually made in Flash please let me know.