 Averroes’ theory of celestial influence and Thomas Aquinas’ media via became mainstream in the Latin middle ages. A few authors, however, followed Avicenna in allowing for the spontaneous generation of human beings, among them Albertus Magnus, Blasius of Parma, and, in the Renaissance, Pietro Pomponazzi, Paolo Ricci and Tiberio Russiliano. Pomponazzi makes the spontaneous generation of human beings dependent upon the conjunction of the superior planets Jupiter and Saturn, and thus introduces another Arabic theory into the discussion: Albumasar’s astrological theory of the great conjunctions (Nardi 1965).