“Most would not recognize the term,”Magna Charta” or “Battle of Hastings”, I doubt that one percent could say what the battle of Hastings was about.”
Carta = Charta
http://pages.prodigy.net/reed_wurts/magnacharta/magchrt.htm
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I find carta used by some now but the link above goes to a website that uses charta. Magna Charta is the spelling used when I learned about it in grade school, it means great charter. Had I used carta in grade school it would have been considered a misspelling.