Jehuda Cresques

After the Aragonese persecutions of 1391 he was forcibly converted[1] to Christianity, at which time he took the name Jaume Riba, Jacobus Ribus, in Latin.

It has long been believed that Jehuda Cresques is the same person as 'Mestre Jacome', a Majorcan cartographer induced by the Portuguese prince Henry the Navigator to move to Portugal in the 1420s to train Portuguese map-makers in Majorcan-style cartography.

[2] 'Jacome of Majorca' was described as the head of Henry's legendary observatory and "school" at Sagres by Samuel Purchas.

[3] The identification of "Mestre Jacome" with Jehuda Cresques" is principally due to the Catalan historian Gonzalo de Reparaz (1930).

[4] More recent research argues that Jehuda Cresques was dead by 1410,[5] and "Mestre Jacome" must have been someone else, identity still indeterminate - Majorca had many skilled Jewish cartographers.