in the Spanish Low Countries and the neighbouring territories. In 1634 he published his first book touching the topic of heraldry, containing a hatching table, and his main heraldic work with a coherent hatching system was published in 1638 in Rome.

Contribution of engravers to development

According to the data from the Plantin-Moretus archive, the emblems in Petra Sancta's 1634 book were initially prepared by artist-engravers in the service of the Jesuit monks, and then redone by André Pauwels

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