Work on Šibenik cathedral inspired Nicola for his work on the expansion of the Chapel of Blessed John of Trogir in 1468. Just like Šibenik cathedral, it was composed out of large stone blocks with extreme precision. In cooperation with the student of Juraj Dalmatinac, Andrija Aleši, Nicola has achieved unique harmony of architecture and sculpture according to antique ideals. From inside, there is no flat wall. In the middle of the chapel, on the altar, lies the sarcophagus of blessed John of Trogir. Surrounding are reliefs of putti carrying torches that look like they are peeping out of doors of the Underworld. Above them there are niches with sculptures of Christ and apostles, among them are more putti, circular windows encircled with fruit garland, and a relief of the Nativity. The ceiling is coffered, with the image of God in the middle and 96 portrait heads of angels.