Jacopo Appiano, whom the Visconti persuaded to turn Judas, and to entrap and murder his benefactor and his children.  The assassination took place in 1392.  In 1399 Gherardo, son of Jacopo Appiano, who held Pisa at the disposal of Gian Galeazzo, sold him this city for 200,000 florins.[6] Perugia was next attacked.  Here Pandolfo, chief of the Baglioni family, held a semi-constitutional authority, which the Visconti first helped him to transmute into a tyranny, and then, upon Pandolfo’s assassination, seized as his own.[7] All Italy and even Germany had now begun to regard the usurpations of the Milanese despot with alarm.  But the sluggish Emperor Wenceslaus refused to take action against him; nay, in 1395 he granted to the Visconti the investiture of the Duchy of Milan for 100,000 florins, reserving only Pavia for himself.  In 1399 the Duke laid hands on Siena; and in the next two years the plague came to his assistance by enfeebling the ruling families of Lucca and Bologna, the Guinizzi and the Bentivogli, so that he was now able to take possession of those cities.

    [1] Il Biscione, or the Great Serpent, was the name commonly given
    to the tyranny of the Visconti (see M. Villani, vi. 8), in allusion
    to their ensign of a naked child issuing from a snake’s mouth.

    [2] Corio, p. 255, tells how the murder was accomplished.  Antonio
    tried to make it appear that his brother Bartolommeo had met his
    death in the prosecution of infamous amours.

[3] Savoy was not in his hands, however, and the Marquisate of Montferrat remained nominally independent, though he held its heir in a kind of honorable confinement.  Venice, too, remained in formidable neutrality, the spectator of the Visconti’s conquests.

[4] The policy adopted by the Visconti against the Estensi and the Gonzaghi was that recommended by Machiavelli (Disc. iii. 32):  ‘quando alcuno vuole o che un popolo o un principe levi al tutto l’ animo ad uno accordo, non ci e altro modo piu vero, ne piu stabile, che fargli usare qualche grave scelleratezza contro a colui con il qual tu non vuoi che l’ accordo si faccia.’

[5] This lady was a first cousin as well as sister-in-law of Gian Galeazzo Visconti, who in second marriage had taken Caterina, daughter of Bernabo Visconti, to wife.  This fact makes his perfidy the more disgraceful.

[6] The Appiani retired to Piombino, where they founded a petty despotism.  Appiano’s crime, which gave a tyranny to his children, is similar to that of Tremacoldo, who murdered his masters, the Vistarini of Lodi, and to that of Luigi Gonzaga, who founded the Ducal house of Mantua by the murder of his patron, Passerino Buonacolsi.

[7] Pandolfo was murdered in 1393.  Gian Galeazzo possessed himself of Perugia in 1400, having paved his way for the usurpation by causing Biordo Michelotti, the successor of the Baglioni to