Regency

Japanese: Regency

… In England, since the Norman period, there have been many cases in which the Lord Justiciar acted as regent during the absence of the king, and in the early modern period, this was determined mainly by acts of parliament. However, in British history, the Regency refers to the period (1811-20) when George III suffered from a brain disease and the Prince of Wales (later George IV) became regent. It was the end of the Napoleonic Wars, and was a time when the Luddite movement and the Peterloo Massacre occurred. …

From the Hanover Dynasty

…However, as the French Revolution became more radical and counter-revolutionary sentiments grew stronger in England, Pitt himself became more conservative. In his later years, the King fell ill and the so-called Regency was established by the Prince of Wales (1811). Thus, most of the important foreign affairs, from the Napoleonic Wars to the Congress of Vienna, were handled under the Regency. …

*Some of the terminology that mentions "Regency" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…　イギリスでもノルマン朝のころから王の不在中に大司法官が摂政を務めた例は多く，近世ではもっぱら議会の法令によって決定された。しかしイギリス史で〈摂政時代Regency〉というと，ジョージ3世が脳病を患い皇太子(のちのジョージ4世)が摂政となった時期(1811‐20)を指す。ナポレオン戦争の末期で，ラッダイト運動，ピータールーの虐殺事件などが起こった時代である。…