Kojiki va Nixonshokida Ankan haqida maʼlumotlar kam uchraydi.[2].Ankan mamlakatni 6-asrning boshlarida boshqargan deb hisoblanadi, ammo u haqida maʼlumotlarning kam. Keyingi tekshirish va oʻrganish uchun materiallar yetarli emas.[3]. Uning qabrining qayerda ekanligi ham mmaʼlum emas.[4][5].
Ushbu imperatorning hayoti yoki hukmronligi uchun hech qanday qatʼiy sanalar tayinlanishi mumkin emas, ammo u odatiy ravishda 531-yildan536-yilgacha hukmronlik qilgan deb hisoblanadi.
↑Hoye, Timothy. (1999). Japanese Politics: Fixed and Floating Worlds, p. 78; excerpt, "According to legend, the first Japanese Emperor was Jinmu. Along with the next 13 Emperors, Jinmu is not considered an actual, historical figure. Historically verifiable Emperors of Japan date from the early sixth century with Kinmei.
