Giovanni Antonio Maggiolo

Maggiolo worked in Genoa as a maker of portolan charts, the manuscript nautical charts used for Mediterranean and European coastal navigation. Christie's catalogues a portolan chart of Europe, made in Genoa and dated 1577, signed "Carta Da Navegar per le Coste de Europa tutta da poniente et da levante," and lists the maker as "MAGGIOLO, Giovanni Antonio (d. before 1600)." Specialist cartographic research by Tony Campbell attributes a small group of further dated charts to him, including examples associated with 1565, 1575, and 1578, and situates him within the broader Maggiolo family of Genoese chart makers active from roughly 1528 to 1600.

No documented birth date or birthplace for him has been located. His death is likewise not fixed to an exact date: Campbell's research notes that his son, Baldassare Maggiolo, begins signing himself "Quondam Giovanni Antonio," meaning "the late Giovanni Antonio," from 1600 onward, a usage that indicates the father had died by that point. Christie's catalogue entry for the 1577 chart similarly identifies him as "d. before 1600." Based on his lifelong association with Genoa and the continuity of the family workshop there, it is likely, though not documented outright, that he died in Genoa. No exact death date is confirmed in the sources reviewed.

No record of formal schooling survives for him. Cartographic historians describe chart making in this period as a workshop craft passed down within families rather than taught through institutions, and no specific master or apprenticeship years are documented for him personally.

Readers should be careful not to confuse him with several similarly named figures: Vesconte Maggiolo, an earlier member of the same Genoese chart-making family; Giovanni Antonio Magini, a Bologna-based astronomer and mathematician (1555 to 1617) who is a wholly different person; and Giovanni Andrea Magliuolo, a Neapolitan painter active 1580 to 1603. This profile follows the Christie's auction-catalogue identification of "Giovanni Antonio Maggiolo" as the chart maker associated with the 1577 signed Europe chart.

There is no body of art-critical writing about Giovanni Antonio Maggiolo in the way a painter or contemporary artist would be reviewed. What exists is cartographic-historical scholarship. Tony Campbell's research treats surviving charts and fragments as evidence for reconstructing the Maggiolo workshop's chronology and output, attributing several dated examples to Giovanni Antonio specifically within the family's broader production. No exact, attributable quotation from a named critic in a major outlet has been located for him.

No verified public auction sale, price, or date has been located for a work signed by Giovanni Antonio Maggiolo. Christie's has catalogued a signed and dated 1577 portolan chart of Europe attributed to him, but the available record does not include a realized price. A separate 2020 preview of an Il Ponte Casa d'Asta sale in Milan references a "Maggiolo chart" with an estimate of 50,000 to 80,000 euros, but the preview does not confirm the full attribution to Giovanni Antonio specifically, nor does it report a hammer price. On the current record, no auction high can be stated for this artist.

There is no catalogue raisonne, no confirmed gallery or estate representation, and no confirmed museum collection holding for this artist based on the sources reviewed. Attribution of any chart to him depends on the signature and date inscribed on the object itself and on specialist cartographic scholarship, not on any artist market infrastructure. Given the absence of a documented auction record, collectors encountering a chart attributed to Giovanni Antonio Maggiolo should treat attribution and dating as a specialist manuscript-map question, verified through provenance and expert opinion, rather than through any comparable-sales market data.