Petrus Keschedt (fl. 16th Century) Petrus Keschedt was a 16th century engraver and publisher based in Cologne, Germany. He is best known for his nefarious piracy of Giovanni Magini's 1596 issue of Ptoloemy's Geographiae. Click here for a list of rare maps from Petrus Keschedt. Rare maps by Petrus Keschedt currently for sale. Rare maps by Petrus Keschedt in the Geographicus Antique Map Archive.