27/09/2012 09:19 BST | Updated 27/09/2012 12:09 BST

David Cameron On Letterman: 7 Other Magna Cartas That May Have Confused The PM

While David Cameron might not know what the literal translation of Magna Carta is, did you know that the Queen once owned a horse named after the 13th century charter of political rights?

Inspired by our prime minister's Magna Carta mindblank, here are seven you probably didn't know about.

Oh, and by the way David, Magna Carta translates from Latin to Grand Charter.

Magna Carta