English: Regency
Welsh: cyfnod y Rhaglywiaeth
Subject: Ystadau a Cadw
English definition: Strictly speaking, the period (1811-1820) during which the future George IV took over from his father the 'mad' George III and acted as Regent (ie reigning in the place of the King). Generally, in architecture, the term is taken to mean the period from the 1790s to about 1840. It is therefore synonymous with 'late Georgian', and embraces the reign of William IV and the first few years of Queen Victoria's reign. 
Welsh definition: A bod yn fanwl, y cyfnod (1811-1820) pan gymerodd Sior IV yr awenau oddi ar ei dad, Sior III ‘wallgfof’ a gweithredu fel Rhaglyw (h.y.teyrnasu yn lle’r Brenin). Yn gyffredinol, mewn pensaernïaeth, defnyddir y term am y cyfnod o’r 1790au hyd tua 1840. Felly, y mae’n gyfystyr â ‘Sioraidd hwyr’, ac yn cynnwys teyrnasiad Gwilym IV a blynyddoedd cyntaf teyrnasiad y Frenhines Fictoria.
Welsh context: Ffynhonnell: Taflen wybodaeth gyhoeddus Cyngor Gwynedd.