GUIDICCIONI, GIOVANNI. - Diplomat, born at Lucca on 25 February 1500, died at Macerata on 26 July 1541. Secretary to Card. Alessandro Farnese, governor of Rome when Farnese became Pope Paolo III, bishop of Fossombrone. In 1535 he was sent as nuncio to Spain to Carlo V, whom he subsequently followed to Tunisia and Provence. He was president of Romagna and, in the war against Ascanio Colonna, commissary general of the papal army.
In the Lettere di negozi (in Opere, 2 vols., Firenze 1867), stylistically comparable to those of Guicciardini, he gives an account of his diplomatic activity. Among his discourses, noteworthy is the Orazione ai nobili di Lucca (Roma
GUIDO D'AREZZO - The oldest copy of the Micrologus of G. d'A. The hand represented here is one of the very earliest examples of the so-called Guidonian hand for musical dictation; the notes are marked on the fingers. On the left, the hymn O Roma nobilis with Guidonian alphabetical notation on a hexachordal staff - Montecassino, Abbey Library, cod. 318 (late 11th century).
1945, edited by C. Dionisotti, V. introd. pp. 5-81) in defence of the “ragamuffins.” He also composed Rime (Bari 1914) in a Petrarchan vein. A. Caro spoke of G.’s humanistic and Christian wisdom in the Lettere familiari (Florence 1920, pp. 272-80), on the occasion of his death.