who were the participants?
27 ecclesiastical and secular magnates and 25 barons.
Magna Carta
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. The process of appointment is not known, but the names were drawn almost exclusively from among John's more active opponents. They are listed here in the order in which they appear in the original sourc
what are the 63 clauses of the magna carta UNANSWERABLE when was it signed? There were no signatures on the charter of 1215.
wiki:25664836
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.