There were retired emperors, including cloistered emperors, both before and after the Heian period, but the notion of cloistered rule as a system usually refers to the practice put in place by Emperor Shirakawa in 1086 and followed by his successors until the rise of the Kamakura shogunate in 1192.
Hierdoor zal op wereldschaal de emissie van voor het klimaat schadelijke gassen niet verminderen.WikiMatrix WikiMatrix