In 1584, while living in London under the protection of the French ambassador Michel de Castelnau, Italian Dominican friar and philosopher Giordano Bruno published 'De l'Infinito, Universo e Mondi' ('On the Infinite Universe and Worlds'). In this revolutionary work, Bruno expanded beyond the Copernican heliocentric model to propose a cosmos with infinite solar systems, each populated by inhabited worlds. Bruno's cosmology, which rejected the traditional Aristotelian finite universe with fixed celestial spheres, helped lay groundwork for modern cosmological understanding, though it also contributed to charges of heresy that eventually led to his execution in 1600.