Frank Hall said:
One of the oldest orders of the trumps, possibly the original order, places the Justice card penultimately, after the Angel, before the World. Does this not suggest Platonic influence, since to Plato Justice is the ultimate power for a harmonious community? Thus, the virtue of Justice creates or inspires the community of the World. Why would gaming Christians place Justice at position twenty, just before the World and after the Angel of the judgment? Your thoughts about this would be helpful.
Well ... the point is, that in the concrete Trionfi card case not the anonymous Platonic influence, but duke Borso of Ferrara in person had a specific favor for the virtue of Justice (although one might call this a result of Platonic influence, but actually this is a somehow private circumstance). As we know by documents, Borso might be called the major commissioner of the early Trionfi cards, at least we have the most surviving documents about him and Trionfi cards.
And Borso had been the ruling hand in Ferrara, 1450 - 1471.
The humanists weren't very enthusiastic about Borso, the intellectual brother Leonello, who reigned before Borso (1441 - 1450), had more friends between them. Borso wasn't very fit with Latin language and prefered vernacular literature. His sponsored artistic productions were the project of the Borso bible, famous as the highest development of bookpainting and manuscript production (5 years production time, involved many artists) short before the general invention of the printing press, and the Palazzo Schifanoia, celebrating an astrologic poem of Roman time.
Probably one can both productions not identify as results of Platonic influence. Borso was somewhat pompous, but peace loving (after a somewhat very unlucky militaric experience in his youth, which made him a prisoner).
And as a ruler he was interested to present the Justice aspect ... natural political propaganda.