Las nueve reglas de la espada de dos manos, y la práctica de la esgrima en Zaragoza hacia 1526

This article studies one of the two oldest treatises on fencing written in Spanish. With the purpose of finding out who authored this text, this article gathers information on where and how it was produced, with new documents on teaching fencing, exams, contracts from apprentices for fencing degrees, and their concessions, licences, appointments, etc. The new documents uncover some practically unknown high masters and fencing masters, whose hand could have written the treatise.