Giovanni Battista Costa (painter, fl. c. 1670) explained
Giovanni Battista Costa was an Italian painter, active in Milan about 1670.
The churches of San Agostino, San Giovanni and San Eustorgio in Milan each have a painting by him.[1][2]
Sources
Martin, Andrew John (2021). "Costa, Giovanni Battista (1670)". In Beyer, Andreas; Savoy, Bénédicte; Tegethoff, Wolf (eds.). Allgemeines Künstlerlexikon - Internationale Künstlerdatenbank - Online. K. G. Saur. Retrieved 7 October 2022.