More mathematical musings in the Rosette folio

[Searcher]

It makes sense to consult what contemporary commenters (e.g. de Lyra) thought about it; anyway, these 70 or 72 men do not seem relevant to the picture in question.

Actually, this is not my real point. These numbers may refer us to the Old Testament, but I doubt in their literal meaning, I even feel doubts, those 72 elders really existed.  In general, those 70-72 men are not so relevant, the numbers: 3, 6, 12, 13  and 72 are relevant in this case. 
I prefer to think about this as about elements of cosmogony or astrology. So, I think, the author was an atheist and a heretic (Aren't you surrised?) in a particular measure.
3 - the Trinity, three Heavens, three-dimensional spase, the time: Past Present Future, Birth Life Death, Beginning Middle End etc.
6 - six days of the Creation, a human.
12 - 12 months, 12 Zodiacal signs...
13 - 13 lunar months (sometimes, solar), 13 constellations on the ecliptic
72 - 72 years period in precession, 72 paranatellonta.


to be continued...