Relations between Venice and Constantinople are getting tense, even as commercial activity is booming. With Emperor Manuel’s universalist ambitions showing no signs of abating, and the equally acquisitive Frederick Barbarossa on their doorstep to the west, the Venetians have a difficult path to tread. And then, on St Gregory’s Day 1171, Manuel takes a dramatic step that ensures that things will never be the same again.

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Intro and outro music is Primavera from Vivaldi’s Le Quattro Stagioni, used under Creative Commons licence from musopen.org