[MAGNATE CONSPIRACY]. Perfetta, e veridica relatione delli processi criminali, et essecutioni delli medi, fattasi contro li trè conti Francesco Nadasdi, Pietro di Zrin, e Francesco Christofforo Frangepami. Vienna, Milan: Malatesta, 1671. A handsomely bound copy bearing the arms and cross of cardinal and Knight of Malta Sigismondo Chigi. This scarce work illustrates the trial and execution of the three main perpetrators of the 'Conspiracy of the Magnates', also known as the 'Zrinski-Frankopan Conspiracy'. The unsuccessful revolt was directed against Leopold I of Habsburg by many Hungarian nobles who had refused to accept the treaty of peace with the Ottoman Empire, obtained by ceding strategic Hungarian territories and a large donation of wealth. The leaders of the revolt, Nikola Zrinski, Ferenc Nádasdy, Petar Zrinski, and Francis Christopher Frangipani, felt that the Emperor had undermined the security and interests of the Hungarian kingdom, making himself unworthy of wearing the crown. 4to, (290 x 200mm). 11 (of 12, missing the last) engraved plates with contemporary hand-colouring, some accompanied by an explanatory leaf of the figures, 48 pages of text (light wear). Contemporary calf, arms of Cardinal Sigismondo Chigi (1649-1678) blocked to boards in gilt (some light wear). (1)