"Mestre Jacome" the Majorcan cartographer is first mentioned by Duarte Pacheco Pereira in his Esmeraldo de situ Orbis (c.1507, p.58). João de Barros, in his Decadas de Asia (1552: I.16 p.133) adds that he was also a master instrument-maker.
"He also from Majorca caused one Master James, a man skillful in Navigation, in Maps and Sea Instruments, to be brought into Portugal, there at his charge as it were, to erect a School of Marinership, and to instruct his Countrymen in that Mysterie."
Samuel Purchas, Hakluytus Posthumus, (1625, vol. 2, pt.2 p.11) See, ‘The alleged nautical school founded in the fifteenth century at Sagres by Prince Henry of Portugal, called the ‘Navigator’’, in W. G. L. Randles, Geography, cartography and nautical science in the Renaissance: the impact of the great discoveries (Aldershot, 2000), pp. 1 – 14.
