teaching liberal arts. Under them there were the , who mostly taught advanced Latin grammar, and the , who provided more basic Latin lessons. The lowest-ranking teachers were the , also called in other studiums, who merely repeated the lessons from the other teachers. The studium also had a rector, who was an apostolic position that represented the archbishop's power in this primitive university, and had the power of approving all the academic positions in the studium, and administrated the fees from the students for reparations and other needs of the university. The primitive University of Zaragoza had a Faculty of Aristotelian Logic and another of philosophy (it included both natural philosophy and Aristotelian ethics), and all together they formed the Faculty of Arts. But this studium generale also had a Faculty of Grammar, which had several hundred students during the early 16th century, while the Faculty of Arts had near 50. In order to get their grades, the students had to be endorsed by another older student or teacher, pass private exams, and pay fees. Lessons were taught in the mornings and afternoons, which meant that many of them would rent chambers to stay in at night. This primitive University of Zaragoza had physician master Pedro La Cabra as its first high master, and after him the maestre Luis Gorriz, who died in 1510. After him, the archbishop appointed his personal physician, master Juan Tarabal, who remained in this position until 1520, when the archbishop died because of the plague. That year Tarabal was substituted by master Gaspar Lax, a prolific author and prominent European figure in logic, philosophy and mathematics, whose works were used in many other contemporaneous universities. Lax had been teaching in the University of Paris and later in the university of Huesca, and from 1520 he was simultaneously high master and one of the four masters of arts. This high master had Erasmian friends, both in Paris and Zaragoza, and allowed Erasmus's works to be taught in this studium. The same year, 1520, Michael Servetus – the brilliant nephew of Gaspar Lax – started his studies under the direction of his uncle and the other three masters of arts (Exerich, Ansías, Miranda, Carnicer, Villalpando). Servetus became himself a Master of Arts in 1525, a position he held until 1527, when he had a brawl with his uncle Gaspar Lax, and after being expelled from the