Portolan charts came into use on sailing vessels in the Mediterranean Sea toward the end of the 13th century. Made for and, in many cases, by seamen, these nautical maps were characterized by the system of intersecting loxodromes, or rhumb lines, which crisscross each chart and the ornamented compass rose that usually appears. This atlas of five manuscript charts has been attributed to Juan Oliva, a member of the illustrious Oliva family of Catalan chartmakers who began working in Majorca some time before 1550. The atlas was compiled no earlier than 1590 and perhaps as late as the first few years of the 17th century.View Source
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