who were the participants of the 1215 charter?
Archbishop Stephen Langton, and some of John's loyal supporters, such as William Marshal, Earl of Pembroke.
Magna Carta
 Archbishop Stephen Langton, and some of John's loyal supporters, such as William Marshal, Earl of Pembroke. They are listed here in the order in which they appear in the charter itself:
how did the magna carta advance the cause of liberty Magna Carta still forms an important symbol of liberty today, often cited by politicians and campaigners, and is held in great respect by the British and American legal communities, Lord Denning describing it as "the greatest constitutional document of all times – the foundation of the freedom of the individual against the arbitrary authority of the despot". what is it? A Constitutional document it was first drafted by whom? King John what is the purpose of this constitutional document? To preserve liberties and rights
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Magna Carta [SEP] Lists of participants in 1215
The preamble to Magna Carta includes the names of the following 27 ecclesiastical and secular magnates who had counselled John to accept its terms. The names include some of the moderate reformers, notably Archbishop Stephen Langton, and some of John's loyal supporters, such as William Marshal, Earl of Pembroke. They are listed here in the order in which they appear in the charter itself: The names of the Twenty-Five Barons appointed under clause 61 to monitor John's future conduct are not given in the charter itself, but do appear in four early sources, all seemingly based on a contemporary listing: a late 13th-century collection of law tracts and statutes, a Reading Abbey manuscript now in Lambeth Palace Library, and the "Chronica Majora" and "Liber Additamentorum" of Matthew Paris.