Sentence:  [...] King John bowed to pressure from the rebellious barons and assented to the demands of the barons at Runnymede. For the first time in English history a king had agreed to limit his own power. As importantly, his assent was agreed in writing in the <WSD>Magna Carta</WSD> (which means 'Great Charter'). The physical document meant that the details could be widely distributed and remembered. The importance of the event was apparent immediately, but the long-term consequences across the centuries were unforeseen. Four hundred years later the <WSD>Magna Carta</WSD> was used as a crucial political weapon in the fight between w:Parliament of England 
Meaning of the word marked with <WSD> tags:  A charter granted by King John to the barons at Runnymede in 1215, which is one of the bases of English constitutional tradition; a physical copy of this charter, or a later version.