Lomellini ascended to dogal power on February 4, 1777, the one hundred and thirty in biennial succession and the one hundred and seventy-fifth in republican history.

For the coronation ceremony at the Genoa Cathedral, the Genoese senate ordered a new purple and a new royal cloak for the wear of the previous clothing and greeted the election of the new doge with fifty-one cannon shots instead of the thirty thunder routines.

During his dogate the ruinous fire of the Ducal palace occurred on the morning of November 3, 1777, followed by a prompt reconstruction and embellishment of the Palace.

The following year the construction of the so-called "New Road" was decided.

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