Taihan was one of the Ten Great Disciples of Kukai, and is counted as one of the Four Sages, but because very little is known of his priestly career, he is frequently considered as on a par with Kojo, another disciple of Saicho's, but this comparison is considered an error.
空海門下の十大弟子、また四哲の一人とされるが、履歴が不明な事から、しばしば最澄の弟子・光定と同一視される向きもあるが、これは誤りといわれる。