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Between 1791 and 1819, the foundation of the Naples Observatory unfolded through a sequence of political and dynastic ruptures that shaped its timing, form, and purpose. From the initial project promoted by Ferdinand IV, to the provisional seat at San Gaudioso under Joseph Bonaparte, and finally to Murat’s 1812 decree that launched the construction of the Capodimonte Specola, the institution remained suspended for decades between scientific ambitions and the instability of power.
This contribution reconstructs that trajectory by highlighting the decisive role played by Giuseppe Piazzi, summoned to Naples in 1817 by Ferdinand I to rationalize the original plan and bring the building to completion. Drawing on his international prestige, Piazzi reactivated the construction works, defined an advanced instrumental layout, and identified Carlo Brioschi as the key figure for the Observatory’s future scientific direction. The paper shows how the authority and pragmatism of the Valtellinese astronomer transformed a long history of decrees and interruptions into the operational reality that led to the “first light” of 17 December 1819.