Before revision: But it's unforgivable that some scholars arrived to the point (based in a high cartographic ignorance), to attribute the invention of portolans to the school of the Infant, if not to him personally .. but how could that make sens , being the school founded by the emigrated Cresques (about 1400), when at his seventies he was tired of manufacturing planispheres, during half a century, for the insatiable Peter the Ceremonious and for his son, the also map-maniac DON JOAN.. On top of that one should not forget to include the testimony of Pacheco Pereira...: And he continues..
After revision: But it's unforgivable that some scholars arrived to the point (based in a high cartographic ignorance), to attribute the invention of portolans to the school of the Infant, if not to him personally .. but how could that make sense , being the school founded by the emigrated Cresques (about 1400), when at his seventies he was tired of manufacturing planispheres, during half a century, for the insatiable Peter the Ceremonious and for his son, the also map-maniac DON JOAN.. On top of that one should not forget to include the testimony of Pacheco Pereira...: And he continues..