Frederick Barbarossa (Holy Roman Emperor; 1122–1190)
Frederick Barbarossa was Holy Roman Emperor from 1155, and fought several wars in Northern Italy 1158–1174, in which Venice was involved indirectly.
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Stratagemi Ingegnosi — Ingenious Stratagems — Grevembroch 4-52
“Stratagemi Ingegnosi” (Ingenious Stratagems) from the Gli abiti de veneziani (1754) by Giovanni Grevembroch, translated by René Seindal.