highly esteemed emperor's reign
Archaic honorific term used in classical Japanese to refer to the reign of a virtuous or highly respected emperor. Not used in modern everyday language.
"Hijiri no miyo" is an expression found in old waka poems and historical writings.
Compound of 聖 (hijiri, 'sage, holy person, emperor') + の (no, possessive particle) + 御代 (miyo, 'imperial reign'). The exact historical derivation is uncertain, but it follows a common pattern of honorific expressions for imperial reigns in classical Japanese.