When the three-story pagoda was established and how the temple was constructed are shown in a historical material called 'Hokki-ji Sanjuno Robanmei' (the description carved on the base of the pagoda finial of Hokki-ji Temple) which was cited in a medieval document titled "Shotoku Taishi denshiki" (the Private Recollections of the Life of Prince Shotoku) (written by Kenshin in 1242.
三重塔の建立時期、及び寺の建立経緯については、『聖徳太子伝私記』（仁治3年・1242年、顕真著）という中世の記録に引用されている「法起寺三重塔露盤銘」という史料がよりどころとなっている。