Johann SADELER (1550 - 1600) - "ASTRONOMIA", "GEOMETRIA" & "GRAMMATICA". 1570-1600. Reunion of 3 etching and burin plates after Martin de VOS (1532-1603). Plates from the "Seven Liberal Arts" series. First coined in the Middle Ages, the term "liberal arts" refers to the fields of study deemed necessary for an education rooted in classical antiquity. These disciplines, divided into two categories - the trivium (grammar, dialectics and rhetoric) and the quadrivium (arithmetic, geometry, astronomy and music) - became recurrent themes in early modern allegorical prints. Approx. 14.7 x 10.5 cm per plate. Condition C (cut on or at the edge of the subject, a few tears previously restored, proofs doubled, minor paper spotting, as is).