Accurate maps help keep ships safe at sea. In the thirteenth, fourteenth and fifteenth centuries, maps called "portolan charts" recorded the accumulated experience and wisdom of generations of Mediterranean seafarers. Portolan charts were practical, no-nonsense tools made for the use of sailors who sailed "great waters."
Gabriel de Vallseca, also referred to as Gabriel de Valseca was a Catalan cartographer of Jewish descent connected to the Majorcan cartographic school. These leggings feature his most notable map, the portolan of 1439, containing the first depiction of the recently discovered Azores islands.