In 1441, when still resident in Venice, Giorgio was summoned to Šibenik in order to take charge of the construction of the Šibenik Cathedral of St James. He moved by the end of August, and in 1443 was awarded the title of master under the condition set in the contract with the procurators of the Cathedral to take up residence there for at least six years. On 1 September 1446 he agreed to extend his contract as chief architect for another ten years. Giorgio was granted permission to remain in Venice for two months every two years on condition that he did no work there except on his own house. He will work on the Cathedral from 1441 till 1473, although discontinuously because the work were interrupted several times for lack of funds and probably for a fire.
