Directory

1491 CE

A year defined by the siege of Granada nearing its climax, the Treaty of Pressburg shaping Central European politics, and continued Portuguese exploration of the African coast.

Geopolitics & Diplomacy

  • Ferdinand and Isabella intensified the final siege of Granada, the last Muslim emirate in Iberia, negotiating surrender terms with Emir Muhammad XII.
  • The Treaty of Pressburg was signed between Maximilian I of Habsburg and Vladislaus II of Bohemia and Hungary, settling succession disputes in Central Europe.
  • The Republic of Florence under Lorenzo de' Medici maintained a fragile peace among the major Italian powers through diplomacy and cultural patronage.

Conflict & Security

  • Spanish forces encircled Granada, constructing the military camp of Santa Fe as a permanent siege base outside the city walls.
  • The Songhai Empire under Askia Muhammad consolidated control over trans-Saharan trade routes through military expeditions in West Africa.

Science & Discovery

  • Martin Behaim in Nuremberg created the Erdapfel, one of the oldest surviving terrestrial globes, reflecting contemporary geographic knowledge and its limitations.
  • Christopher Columbus, a Genoese navigator residing in Spain, finalized negotiations with Ferdinand and Isabella to fund a westward voyage across the Atlantic.

Climate & Environment

  • Atmospheric carbon dioxide concentration was approximately 273 parts per million, as later confirmed by ice core analysis.

Culture & Society

  • Lorenzo de' Medici, the de facto ruler of Florence and one of the greatest Renaissance patrons, died the following year, but in 1491 his court remained a center of culture.
  • Leonardo da Vinci continued his work in Milan, pursuing painting, anatomical studies, and engineering projects under Ludovico Sforza's patronage.
  • The Aztec Empire in Mesoamerica reached its greatest territorial extent under Ahuitzotl, with Tenochtitlan among the largest cities in the world.
  • The Ming Dynasty in China under the Hongzhi Emperor promoted Confucian governance and cultural stability, presiding over a population exceeding 100 million.
  • The estimated global population was approximately 467 million, with the largest concentrations in China, the Indian subcontinent, and Europe.