Considering the document context, the Magna Carta established the rights of "individuals."
Magna Carta was made around 1215 in England under the regime of King John.
Magna Carta contains the established tenet that all individuals are subject to the law of the land, including the king.
Magna Carta ensures the rights of individuals are guaranteed, including the right to justice and the right to a fair trial.
Hence, in this case, it is concluded that Magna Carta established the rights of "individuals."
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