Sharing the Discovered Lands

Sharing of Discovered Lands – Treaty of Tordesillas

The Sharing of Discovered Lands was a central process in the political and religious organisation of overseas exploration in the 15th and 16th centuries. These chapters present the instruments and decisions that defined borders, legitimised conquests and shaped the western colonial map.

1. Demarcation of the Tordesillas Meridian

Presents the origin and geographical logic of the imaginary line drawn to divide the areas of influence between Portugal and Castile, the methods of calculation, the cartographic controversies and the immediate impacts on navigation and Atlantic exploration.

2. Treaty of Tordesillas (1494)

Analyses the diplomatic agreement that formalised the proposed division: political context, main terms, negotiations between the crowns, and practical consequences for navigation, colonisation, and territorial disputes.

3. The Bull of Alexander VI

Examines the papal bulls as instruments of religious and political legitimacy: the pontiff’s motivations, the content of the bulls, and their role in reinforcing Iberian claims over the newly discovered lands.

4. Ratifications and recognitions by the Holy See

Addresses the Church’s subsequent confirmations of Portuguese expansion — decrees, concordats, and ratifications — and how these acts consolidated (or contested) Portuguese rights over overseas territories.

5. Purpose of the chapters

Throughout these texts, we will relate documents, geopolitical interests, and practical impacts on populations, navigation, and the formation of colonial empires.