Byzantine archon (ruler) of the Peloponnesian Argolid and Corinth, and leader of resistance against the Frankish conquest in southern and central Greece in the wake of the conquest of Constantinople by the Fourth Crusade (1204).
From around 1200 to 1204, Sgouros established a shortlived state comprising his inherited lands as well as Attica and Megaris, Boeotia, part of Negroponte, Phokis, Thermopylae, and parts of Thessaly, which soon brought him into conflict with Frankish forces attempting to annex Greek territories. He was awarded the high title of sebastohypertatos by the fugitive Alexios III Angelos, whose daughter Eudokia he married at Larissa, the northernmost part of his advance. However, he failed to check the advance of the Franks at Thermopylae and fled south to the fortress of Akrocorinth, where he sustained a siege of almost four years until his death (c. 1208).
A highly controversial figure, Sgouros has been variously characterized as an unscrupulous and ambitious local tyrant, and as a heroic defender of medieval Hellenism against the Frankish conquest.