二十一代集 にじゅういちだいしゅう Collections of the Twenty-One Eras; twenty-one collections of waka compiled by imperial command (early Heian to early Muromachi) n Advanced ➥
勅撰和歌集 ちょくせんわかしゅう poems collected at the behest of the Emperor (from 905 to 1439); Imperial collection of poetry n Advanced ➥