<p>Since 1066, there have been more than forty kings and queens of Britain (give or take a Cromwell, Scotland not included). They are a dazzling cast of characters, and we routinely debate over who deserves the title of greatest ruler in our long history. From William the Conqueror to Henry V, Elizabeth I, Victoria and latterly Elizabeth II ? their lives tell the story of our nation.<br>But how exactly do you measure a monarch?<br>Measuring Monar...