Regnal years of English monarchs Britain), from 1066 to the present day. These are official "de jure" dates, and may or may not coincide with whether a particular king had "de facto" power or not at that time. For example, as the Commonwealth era was suppressed in the official record, the regnal years of Charles II are measured from 30 January 1649 (the day his father Charles I was executed); as a result, when Charles II actually became king, on 29 May 1660, he was already in his 12th regnal year. (For the "de facto" tabulation of English rulers, see any conventional list of English
Duration of English Parliaments before 1660 not the conventional way of numbering Parliaments. The No. column contains the number counting forward from the accession of particular monarchs of England before 1660 (or the Commonwealth and Protectorate regimes of the 1650s). The duration column is calculated from the date of the first meeting of the Parliament, to that of dissolution, using a year-month-day format. Parliament grew out of the Curia Regis, which was a body which advised the King on legislative matters. It had come into existence after the Norman Conquest of England in 1066. It replaced the earlier Anglo-Saxon institution of the Witenagemot, which had a