Shinsei ('kugeshinsei') means a written code established based upon imperial order by Tenno (the Emperor) and Daijo Tenno (the Retired Emperor) from the mid Heian period to the period of the Northern and Southern Courts (Japan).
新制（しんせい）とは、平安時代中期から南北朝時代(日本)にかけて天皇・太上天皇の勅旨に基づいて制定された成文法典（「公家新制」）。