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The second major form is a corrugated rectangle as suggested by Achille Marozzo in his Opera Nova.
The primary sources for the Guild’s Bolognese Swordsmanship training come from five works from the 16th Century: an Anonymous text of c.1550, Antonio Manciolino (Opera Nova, 1531), Achille Marozzo (Opera Nova, 1536), Angelo Viggiani (Lo Schermo, written c. 1550 and published posthumously in 1575) and Giovanni Dall'Agocchie (Dell’arte di Scrimia, 1575).