Who collaborated with Giovanni Battista Tiepolo on the perspective frames in the Udine frescoes?

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Giovanni Battista Tiepolo collaborated with the painter Mengozzi Colonna on the perspective frames for the frescoes at the Palazzo Arcivescovile in Udine. Colonna is described as Tiepolo's faithful collaborator in the execution of these works, which were commissioned by Dionisio Dolfin.1