What is the first regnal year of each English monarch?

 The first regnal year of each English monarch is as follows:

William I (William the Conqueror): 1066

William II (William Rufus): 1087

Henry I: 1100

Stephen: 1135

Henry II: 1154

Richard I (Richard the Lionheart): 1189

John: 1199

Henry III: 1216

Edward I: 1272

Edward II: 1307

Edward III: 1327

Richard II: 1377

Henry IV: 1399

Henry V: 1413

Henry VI: 1422

Edward IV: 1461

Edward V: 1483 (Edward V's reign was brief and disputed, as he was never crowned and was later declared illegitimate by his uncle, Richard III)

Richard III: 1483

Henry VII: 1485

Henry VIII: 1509

Edward VI: 1547

Mary I: 1553

Elizabeth I: 1558

James I: 1603

Charles I: 1625

Charles II: 1660

James II: 1685

William III and Mary II: 1689 (William III and Mary II ruled jointly)

Anne: 1702

George I: 1714

George II: 1727

George III: 1760

George IV: 1820

William IV: 1830

Victoria: 1837

Edward VII: 1901

George V: 1910

Edward VIII: 1936 (Edward VIII's reign was brief, as he abdicated the throne in order to marry Wallis Simpson)

George VI: 1936

Elizabeth II: 1952