Basilio Sabazio was the first in Italy to argue for the unity and corruptibility of either sublunar or celestial matter. In this paper new insight of his intellectual activity between Napoli and Milano is provided, and in particular his relationship with Scipione Capece, from whose letter to Giovan Francesco di Capua, Count of Palena we learn that Sabazio was an expert in philology and astronomy. The surviving part of an essay by Sabazio to the astronomer Francesco Cigalini from Como is (...) here edited with some informations about Cigalini’s reply. A newly recovered Sabazio’s astronomical work is here edited – from which his endorsement of Eraclides Ponticus’ astronomical system is evident –, as well as his Consilium to Pope Paolo III about the urgency of convening a general council. (shrink)