“ His counsels were marred by his reluctance to appeal to arms at the critical moments of action, and by the slenderness of his own resources, but they deserve attention for their broad common sense and spirit of tolerance. As an administrator of his principality he displayed rare energy, issuing numerous ordinances, appointing expert officials, and in particular establishing the finances on a scientific basis. ”

“ The principal fruit of the observations was a catalogue of about a thousand stars, the places of which were determined by the methods usually employed in the 16th century, connecting a fundamental star by means of Venus with the sun, and thus finding its longitude and latitude, while other stars could at any time be referred to the fundamental star. ”