Te longinqua dedit tellus et pascua Rheni,
says Petrarch; and, in 1417, a duke of Guelders and Juliers acknowledges (Lenfant, Hist. du Concile de Constance, tom. ii. p. 539) his descent from the ancestors of Martin V. (Otho Colonna): but the royal author of the Memoirs of Brandenburg observes, that the sceptre in his arms has been confounded with the column. To maintain the Roman origin of the Colonna, it was ingeniously supposed (Diario di Monaldeschi, in the Script. Ital. tom. xii. p. 533) that a cousin of the emperor Nero escaped from the city, and founded Mentz in Germany.