Unfortunately, the vagueness of contemporary accounts prevents us from reproducing with certainty the progress of negotiations on that eventful 15th of June and the few days following. Some inferences, however, may be drawn from the words of the completed Charter itself and from those of several closely related documents. One of these, the Articles of the Barons,[32] is sometimes supposed to be identical in its terms with the Schedule which had been already presented to the King’s emissaries, at Brackley, on the 27th of April.[33] It is more probable, however, that during the seven eventful weeks which had since elapsed, the original demands had been somewhat modified. It is not unlikely that the interval had been employed in making the terms of the suggested agreement more full and specific. The Schedule of April was probably only a rough draft of the Articles as we know them, and these formed in their turn the new draft on which the completed Charter was based. Articles and Charter are alike authenticated with the impress of the King’s great seal, an indisputable proof that the terms of each of them actually received his official consent. ----- Footnote 32: See Appendix. Footnote 33: See _supra_, p. 40. ----- This fact affords a strong presumption that an interval must have elapsed between the King’s acceptance of the first and the final completion of the second; since it would have been absurd to seal what was practically a draft at the same time as the principal instrument. The probability of such an interval must not be lost sight of in any attempt to reconstruct in chronological sequence the stages of the negotiations at Runnymede. A few undoubted facts form a starting-point on which inferences may be based. John’s headquarters were fixed at Windsor from Monday, 15th June, to the afternoon of Tuesday the 23rd. On each of these nine days (with the possible exception of the 16th and 17th) he visited Runnymede to confer with the barons.[34] ----- Footnote 34: So far there can be no doubt. Either on the _Close Rolls_ or on the _Patent Rolls_ (q.v.) copies of one or more writs are preserved dated from Windsor on each of these days, and also one or more dated from Runnymede on 15th, 18th, 19th, 20th, 21st, 22nd, and 23rd June. ----- Two crucial stages in these negotiations were clearly reached on Monday the 15th (the date borne by Magna Carta itself) and on Friday the 19th (the day on which John in more than one writ stated that peace had been concluded). What happened exactly on each of these two days is, however, to some extent, matter of conjecture. It is here maintained, with some confidence, that on Monday the substance of the barons’ demands was provisionally accepted and that the Articles were then sealed; while on Friday this arrangement was finally confirmed and Magna Carta itself, in several duplicates, was sealed.