Unravelling a Trans-Imperial Career: Michel Angelo de Blasco's Mapmaking Abilities in the Service of Vienna and Lisbon

Abstract

During the eighteenth century, the global environment of imperial competition and cooperation encouraged the circulation of highly qualified mapmaking personnel from the service of one ruler to the other, thus contributing to the dissemination of cartographic knowledge. This article examines the career of military engineer and mapmaker Michel Angelo de Blasco (1697-1772), whose life in the service of the Habsburg Monarchy and the Portuguese Empire illustrates the importance of trans-imperial approaches to the history of cartography. As Vienna and Lisbon sponsored large mapmaking enterprises, including border demarcations and military surveys, skilled cartographers became precious resources for these empires. However, in the case of de Blasco, the invaluable service done in Brazil for the Portuguese monarch, made him both sought-after as a potential information source for the Habsburg monarchs and unemployable due to the risk of a diplomatic conflict. The efforts of de Blasco to transition back into the service of Vienna included the unauthorised submission of cartographic material. Additionally, the details of the negotiations regarding this mapmaker's possible transfer reveal the processes of institutionalisation and centralisation Habsburg cartography underwent during the time of Maria Theresa (1740-80).