Background
He was a son of Nanba Yoritsune (難波頼経, Japanese Wikipedia), and the ancestor of the Asukai clan, who were known for their skill at both poetic composition and kemari.
飛鳥井雅経
He was a son of Nanba Yoritsune (難波頼経, Japanese Wikipedia), and the ancestor of the Asukai clan, who were known for their skill at both poetic composition and kemari.
And one of his poems was included in the Ogura Hyakunin Isshu. Being of Fujiwara stock, he was also known as Fujiwara no Masatsune (藤原雅経). Twenty-two of his poems were included in the Shin Kokin Wakashū, and a total of 134 in the imperial anthologies.
Masatsune served three emperors, Go-Toba, Tsuchimikado and Juntoku, in addition to working under the Kamakura shogunate.
Masatsune studied waka under Fujiwara no Shunzei and from 1201 served in the Bureau (和歌所, Waka-dokoro).