Regnal years of English and British monarchs

The regnal years of English and British monarchs are the official regnal years of the monarchs of the Kingdom of England from 1066 to May 1707, the Kingdom of Great Britain from May 1707 to January 1801, and the United Kingdom since January 1801. The regnal calendar ("nth year of the reign of King X", abbreviated to "n X", etc.) continues to be utilized in many official British government and legal documents of historical interest, notably parliamentary statutes prior to 1963, and prior to 1867 in the case law collected in the year books, nominative reporters, and digests, and in the reports republished in the English Reports and Revised Reports. In legal citation, the first monarch of a regnal name is not followed by an ordinal number, but all subsequent monarchs of that name are. Thus, the 25th year of Elizabeth I is simply 25 Eliz., but the 25th year of Elizabeth II is 25 Eliz. 2.