The word portolan comes from the Italian adjective portolano, meaning "related to ports or harbours."
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Giorgio Sideri Callapoda came briefly into the news when his copy of a previously unknown fifteenth-century portolan chart by Fra Mauro was sold at auction in Milan, October 1984 at a price of 900 million Italian liras.
The Weimar map is an anonymous 15th-century Italian portolan chart, held by the Grand Ducal Library of Weimar.
Angelino "Dalorto" is known for a portolan chart commonly dated 1325 (now revised to 1330), privately held by the Prince Corsini collection in Florence.