The information available on Giovanni Battista Mariotti is scarce and fragmented, which reflects the common challenge of documenting the lives of less prominent historical figures in the art world. What can be inferred from the name is that he was likely an Italian artist, as Giovanni Battista is a common Italian name and Mariotti is an Italian surname. However, without more specific details, it is difficult to provide an accurate biography or to identify the individual's contributions to the arts. The name does not correspond with any widely known artist whose life and works have been thoroughly documented and studied in art history. It's possible that Giovanni Battista Mariotti may have been a minor or local artist, a craftsman, or even an artist whose work has not survived or been attributed to him correctly. Without further historical records or scholarly research that provides additional information about his life, artistic style, or body of work, a detailed biography cannot be accurately constructed. If you have any additional information or context about this artist, please provide it, and I will do my best to offer a more comprehensive response.