But many individuals and communities were sceptical. A common response to the Medicean Stars was simply to say that the telescope had a lens defect and was producing illusory points of light and images; those saying this completely denied the existence of the moons.[1] That only a few could initially see and verify what Galileo had observed supported the supposition that the optical theory during this period "could not clearly demonstrate that the instrument was not deceiving the senses."[17] By naming the four moons after the Medici brothers and convincing the Grand Duke Cosimo II of his discoveries, the defence of Galileo's reports became a matter of State.