Read the full text of the Magna Carta , the charter of rights granted by King John to his barons in 1215. Learn about the historical context, the clauses, and the legacy of this document. What Did the Magna Carta Do? Written in Latin, the Magna Carta (or Great Charter) was effectively the first written constitution in European history . Magna Carta -Great Charter, is one of the most significant documents, signed in 1215 by King John, it laid the foundation for modern human rights