Having finished his apprenticeship, he worked, together with his father, at the residence of the Prince-Bishop of Würzburg and then, until the mid-1750s, at the residence of the Prince-Bishop of Speyer in Bruchsal.
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Januarius Zick was born in Munich and began to learn his trade from his father, Johannes Zick, a renowned painter himself, to whom he was apprenticed in order to learn how to paint frescoes.