Today, there is no one who claims to be knowledgeable in the field who does not recognize the importance of Catalan cartographers, most of them Jews from Mallorca, such as Abraham Cresques and Jafuda Cresques, cartographers and compass makers, co-authors of the Atlas Català (Catalan Atlas), a work from 1375, etc. The big problem we encounter is that the "scientific English" of the time was Latin, and since the maps were written in Latin, some Italian scholars have wanted to claim the authorship of many of these documents. For these gentlemen, Petrus Rosselli was −of course!− Italian. However, I know a couple of Catalan Peres Rossell from the same period. In this particular case of Petrus Rosselli we were lucky, because there was another portolan, with the same style, in which it read: "Petrus Rosselli me fecit ab Majoricarum Insulae". And it was possible to establish that he was Catalan from Mallorca (Balearic Islands). Another case of appropriation of Catalan carto...