 In 1714, on Beduzzi's recommendation, Mattielli was appointed sculptor-in-chief at the imperial court of Charles VI.This prestigious appointment garnered him many further commissions from the court, upper aristocracy and churches, such as by Prince Adam Franz von Schwarzenberg, Prince Anton Florian von Liechtenstein, and the family of Count Harrach.He became so inundated with orders that he worked simultaneously on different projects in Vienna, Stift Melk, Lambach Abbey and Mariazell.