Which 1215 document established the constitutional principle of limited government?

Remarkable that the English-speaking world remembers Magna Carta. The product of a struggle between King John and his barons, it was sealed on the bank of the Thames 800 years ago, on June 15, 1215. But in a sense, the most valuable thing about Magna Carta is precisely that it is remembered. Other charters were issued across medieval Europe, but they were rapidly forgotten.