Byzantium controlled key East‑West routes; Italian city‑states (Venice, Genoa) traded luxury goods, spices, silk for Western raw materials.
Byzantine art, theology, and Greek scholarship flowed west, influencing the Renaissance. Western scholars studied in Constantinople.
Emperors sought alliances; Western rulers sought imperial legitimacy. Marriages, embassies, and religious negotiations were common.
Initially cooperative, later the Fourth Crusade (1204) sacked Constantinople, deepening the East‑West schism.
As Byzantium waned, Greek scholars fled to Italy, fueling humanism. Italian maritime powers seized former Byzantine ports.
These interactions shaped medieval and early modern Europe’s economic, intellectual, and religious landscape.