Emperor Saga ( å å å ç Saga-tenn Å ) ( 786 â `` 842 ) of the Heian Period adopted this custom , and celebrated parties to view the flowers with sake and feasts under the blossoming branches of sakura trees in the Imperial Court in Kyoto . Emperor Saga ( å å å ç Saga-tenn Å ) ( 786-842 ) of the Heian Period adopted this custom , and celebrated parties to view the flowers with sake and feasts under the blossoming branches of sakura trees in the Imperial Court in Kyoto .