▁Jak k ō - in ▁and ▁ Ō h ara ▁ ▁Bun ji ▁ 2 , ▁on ▁the ▁ 2 0 th ▁day ▁of ▁the ▁ 4 th ▁month ▁( 1 1 8 6 ): ▁Gy ō sh in , ▁the ▁clo ister ed ▁former - Em peror ▁Go - Sh ira ka wa , ▁visited ▁Ken rei - mon ▁In ▁at ▁her ▁rural ▁retre at ▁in ▁ Ō h ara . ▁ ▁Ken ky ū ▁ 2 , ▁in ▁the ▁ 2 nd ▁month ▁( 1 1 9 2 ): ▁Ken rei - mon ▁In ▁dies ▁in ▁ Ō h ara . ▁ ▁This ▁once - p am per ed ▁great ▁lady ▁is ▁said ▁to ▁have ▁composed ▁this ▁poem ▁in ▁her ▁herm it ' s ▁h ut : ▁ ▁In ▁literature ▁Many ▁stories ▁and ▁works ▁of ▁art ▁dep ict ▁this ▁period ▁in ▁Japanese ▁history , ▁and ▁it ▁is ▁through ▁these ▁sources ▁that ▁the ▁life ▁of ▁Tai ra ▁no ▁Tok uk o ▁is ▁best ▁known . ▁The ▁T ale ▁of ▁the ▁He ike ▁is ▁the ▁most ▁famous ▁of ▁the ▁sources ▁from ▁which ▁we ▁learn ▁about ▁this ▁historical ▁character , ▁although ▁many ▁k ab uki ▁and ▁b un ra ku ▁plays ▁reproduce ▁events ▁of ▁the ▁war ▁as ▁well . ▁ ▁The ▁central ▁theme ▁of ▁the ▁He ike ▁story — and ▁the ▁mirror ed ▁theme ▁of ▁Tai ra ▁no ▁Tok uk o ' s ▁life ▁story — is ▁a ▁demonstr ation ▁of ▁the ▁Buddh ist ▁law ▁of ▁imper man ence . ▁The ▁theme ▁of ▁imper