"Pars hæc vitæ ultima Christo neganda non est" (I must not refuse to Christ this last portion of my life) were the words in which he offered himself to Pius II as leader of a relief to the Republic of Ragusa which was being hard-pressed in 1464 by the Turks.He left no printed works, though he heard from Pius II about the printing of the Gutenberg Bible in a famous letter of 1455, and had an edition of the works of Thomas Aquinas posthumously dedicated to him by the first printers of Italy, Sweynheym and Pannartz, in 1469.