Magna Carta sealed (15-6-1215)

And the linguistic angle is...
"The original is written in medieval Latin, as was normal for official documents at the time..."
And this goes on to scribal abbreviations, which were also normal at the time:
"...in Magna Carta _and_* was written as a dash with a small tail, _per_ ('of') could appear as a letter <p> with a crossbar on the descender, and _nostra_ ('our') was written <nra> with a horizontal line above."
*He should really have written: _et_ ('and').
(Something that came up quite recently in the excerpt from the Chronicle about the Danes sacking Lindisfarne):
"A symbol that looked like the numeral 7 was very frequent in Anglo-Saxon texts as a replacement for _and_: it derives from the symbol used in classical Latin for _et_ ('and') by Cicero's scribe, Marcus Tullius Tiro (and thus often called the 'Tironian _et_')."
As Aidan knew.