1439
Council of Florence Declares Union
The Greek Orthodox hierarchy, desperate for Western military help against the Ottomans, signed an act of union with Rome acknowledging papal supremacy. The deal was a political fiction; Constantinople's streets rioted when the bishops returned. The union lasted as long as the Byzantine Empire: fourteen more years. The philosopher Bessarion, supporting the union, later donated his Greek manuscripts to Venice, creating a foundational library of Western humanism.
Ethiopian Emperor Zara Yaqob Founds Debre Berhan
After witnessing what he believed was a miraculous light descending from the night sky over the Ethiopian highlands, Emperor Zara Yaqob established the city of Debre Berhan, meaning Mountain of Light, as a new imperial capital. The city became a center of theological scholarship and royal administration, anchoring Solomonic authority in the central plateau with new churches, royal compounds, and scriptoria where monks produced illuminated manuscripts in Ge'ez.
Gutenberg Experiments with Press in Strasbourg
Court records from a lawsuit in Strasbourg reveal that Johannes Gutenberg had been quietly experimenting with a secret printing technology involving a modified wine press, hand-cast metal type, and specially formulated oil-based ink. His business partners sued him for withholding the invention's technical details. The trial documents are the earliest surviving evidence of movable metal type in Europe, a full decade before the forty-two-line Bible appeared in Mainz.
Battle of Grotniki Ends Hussite Wars
Polish forces crushed the last Hussite Taborite radicals at Grotniki, ending the final phase of Bohemia's religious wars. Moderate Utraquists dominated Bohemia's religious compromise. Europe's first successful Protestant-style reform movement survived as an institution, a century before Luther. The Hussite legacy included the first successful challenge to papal authority and military innovations that influenced Central European warfare for generations.