Heinrich Winter in Imago Mundi 9 (Winter 1952):1-11; Die Portulankarte des P.R. von 1449 - Kartographie im Mittelalter, Karlsruhe 1989; John Blake: Vermessung der Meere, 2007: 32 ; Focus 1993: 116, 659f., 778;
1446 -1449 active on the island of Mallorca, now Spain
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