Belated reply (was away for the recent American holiday).
As for the photo of the Euganean Hills from Petrarch’s house in Arqua that wouldn’t load from Flickr– here’s someone else’s photo showing the same, but presumably from the garden (too bad as my photo included the long window frame so the image more properly aped the dimensions of a PMB trump card with the similar mountains on the horizon at the bottom – compare “the Star” for instance):
We get pictures with google images, searching for "Casa del Petrarca", "Arqua" etc. and we can walk through Arqua on the search for Casa del Petrrarca (but I find only a wall with trees behind).
As for your focus on 1440 (mine as well since the Giusto diary reference came to light – I’ve been lurking about this webpage for some time and have been enjoying the fruits of yours and everyone else’s research), I’m not sure how Petrarch’s Trionfi matters in terms of being a template for the earliest trionfi cards, not the least of which is that a series of 6 does not follow any known tarot deck series or subset thereof. Your comment - “My logic dictates, that there should have been persons, who made this new popularity of Petrarca. Marcello might have been one of them” – misses in both time and place: Marcello was in the East of Italy, not Florence, and the first mention of him in association with Monselice is in 1441 (King, 1994: 61).
Thanks for this date, which I searched (King's online edition missed it). The decision to buy Monselice castle, likely didn't happen at one day., so one cannot think of precise dates. Marcello was useful in the war, which took a pause in autumn 1440, likely he got some income through it, and it was possible, that he could buy it. He got the job to care for the connection to Francesco Sforza in 1442. But perhaps Monselice had some function in the plans of Venice, how to care for Sforza, if it would have been necessary that he stayed at Venice territory. Monselice is near to Ferrara and near to Mantova, both had been in the war before not solid in their political decisions. A part of the Sforza army in this region would have given, that, Ferrara and Mantova in future would have been careful, if they should tun against Venice. Niccolo d'Este died end of 1441, did one know, how Leonello would behave in the future?
(does King mention details ?)
And Monselice was more or less the nearest Venetian point to Fermo, where Sforza for the situation "after 1441" was expected to have been located beside his 2nd capital in Cremona.
Well, I don't think, that Marcello participated in the invention of Trionfi cards, but in contacts Venice-Florence he might have played a role. Generally people of Venice didn't perceive themselves as Italians, but Marcello might have had proven much more open-minded for the Italian mind than other persons in Venice and therefore he was used to guard the communications in this direction. Monselice for natural reasons controlled the trading route Bologna/Ferrara - Padova/Venice.
Like the production of Petrarchan-related works of art, this comes right after the earliest known deck of 1440 but one could still posit that the Anghiari triumphal celebrations (or earlier Council of Florence as you would have it) and perhaps related trionfi deck paid for by Giusto inspired the subsequent Petrarchan works. However the very fact that Piero de Medici had to commission a Venetian artist (Matteo de Pasti) in 1441 - while Giusto specifically mentions commissioning his deck in Florence - militates against the idea that Petrarch’s Trionfi were in any way a common production in Florence before 1440 (and there is nothing to suggest anything happened in the intervening period from the time Cosimo acquired his copy in 1418). The auction house listing for one of those works clearly illuminates why Florence became interested in Petrach: “The Visconti were likely to have regarded themselves as having a particularly close association with Petrarch for the poet was for many years the friend and protégé of successive Visconti lords of Milan.” After the 1440 defeat of the Visconti-backed Albizzi exiles at Anghiari it became a point of civic pride to reclaim one of the “three crowns” for the Medici regime (that influential Florence helped spread the fashion for Petrarch in the Quattrocentro to other cities is unsurprising but still not relative to the earliest 1440 deck).
Thanks, you know the situation quite well, and even the newest developments are not foreign to you. You are a careful reader.
Well, there are a few things between 1418 - 1440:
1418: new pope in Milan, likely new books in Italy and other general influences from the council of Constance.
1423: Jubilee year ... which should mean traffic and tourism and festivities.
1423: Triumphal festivity by Alfonso and Jeanne of Naples. Two weeks later the both have war with each other.
1424: Philodoxus of Alberti, theater play in Bologna. Twice are mentioned "triumphal processions".
1425: Trionfi of Filippo Maria Visconti in Milan
1431-33: Emperor Sigismondo in Italy
1433: Masquerade with Greek gods in Ferrara, possibly in relation to a wedding between a Parisina daughter and young Sigismondo Pandolfo Malatesta.
(Generally the period 1425-1440 must be regarded as a time of war, which with only short pauses didn't allow too much festivities.)
1438: Council in Ferrara
1439: Council in Florence
So there is a sort of period with triumphal activities 1423-1425, possibly triggered by the Jubilee year, but it's likely not really comparable to the 1450 Jubilee event.
Finally, to get back to your original point, Marcello, despite the large corpus of literary and artistic works commissioned and gifted to him, only had one work associated with him that is (very loosely) connected to Petrach’s Trionfi. But this is a literary gift from a Fortebraccio celebrating Marcello’s deeds and merely alludes to his life’s achievements as a series of “triumphs” a’la Petrarch and dates from after 1458 (King, 1994: 51).
Likely Carlo Fortebraccio, condottiero, son of Braccio, the earlier great condottiero opposed to Muzio Attendola. I don't get the passage from the online edition. Do you have details about this passage?
Fortebraccio has a biography at condottieridiventura:
http://www.condottieridiventura.it/cond ... ONTONE.htm
He had been in the Veneto 1458, accompanying Colleoni.