How many barons had their rights improved by Magna Carta when it was signed in 1215?

And how did this number evolve later?

The supervising council consisted of 25 barons, but I presume more barons could have been affected.

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    Quick google search suggests that we don't have a precise count of the number of barons, but One historian has suggested that there were about twelve earls in England, and between 100 and 150 barons.. How many of those had their rights improved is a more difficult question. Wikipedia enumerates the barons in 1294; that might serve as a starting point for research. – Mark C. Wallace Jul 9 '20 at 12:01
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    The original agreement kind of fell apart immediately so in practice the number may as well be zero. – Semaphore Jul 9 '20 at 13:02
  • @MarkC.Wallace thank you! Is it really this basic though - there are other titles, such as dukes and counts, probably this was applied, at least to some extent, to the sons and family members, etc.? – Yulia V Jul 10 '20 at 10:02