Giuseppe Cesari
In the "Considerazioni", he distinguishes four tracts of painting in his contemporary Rome: that of Caravaggio; that of Carracci; the third of Giuseppe Cesari; and the fourth of everybody else, the mannerist painter Cristoforo Roncalli for instance. There is evidence that he knew, at least Caravaggio, well, having attended to the artist when he was ill and staying at the Palazzo Madama, probably in 1595. Mancini was also well acquainted with Caravaggio's benefactor, Francesco Maria del Monte.