In the Veneto region of Italy there are about 300 Venetian Villas tagged as "historic=manor" plus "manor:type=venetian_villa" [1] This could be a model, as the historic function of those villas was most likely very similar to the ones listed in your post. [2]
[1] http://overpass-turbo.eu/s/A3H [2] https://en.wikipedia.org/wiki/Riviera_del_Brenta#History_of_the_Venetian_villas
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