The new church of S. Spiridione stands in the same place as the ancient and homonymous eighteenth-century temple built by the "Greek nation" - then also including the "Illyrians" - which had to be demolished in 1861. The Community, wishing to build a particularly important temple, announced a public competition as early as September 1858, to which the most renowned architects of Vienna, Venice, Milan, Munich, Rome, Florence and Petrograd were invited, who had to present their projects no later than 31 March 1859, as reported by the “Osservatore triestino”. The choice of the project was entrusted to the Academy of Fine Arts in Venice.