Under the protection of equal law, the labors of agriculture and commerce were gradually revived; but the martial spirit of the Lombards was nourished by the presence of danger; and as often as the bell was rung, or the standard erected, the gates of the city poured forth a numerous and intrepid band, whose zeal in their own cause was soon guided by the use and discipline of arms.

At the foot of these popular ramparts, the pride of the Caesars was overthrown; and the invincible genius of liberty prevailed over the two Frederics, the greatest princes of the middle age; the first, superior perhaps in military prowess; the second, who undoubtedly excelled in the softer accomplishments of peace and learning.
Ambitious of restoring the splendor of the purple, Frederic the First invaded the republics of Lombardy, with the arts of a statesman, the valor of a soldier, and the cruelty of a tyrant.

The recent discovery of the Pandects had renewed a science most favorable to despotism; and his venal advocates proclaimed the emperor the absolute master of the lives and properties of his subjects.

His royal prerogatives, in a less odious sense, were acknowledged in the diet of Roncaglia; and the revenue of Italy was fixed at thirty thousand pounds of silver, which were multiplied to an indefinite demand by the rapine of the fiscal officers.
The obstinate cities were reduced by the terror or the force of his arms: his captives were delivered to the executioner, or shot from his military engines; and after the siege and surrender of Milan, the buildings of that stately capital were razed to the ground, three hundred hostages were sent into Germany, and the inhabitants were dispersed in four villages, under the yoke of the inflexible conqueror.
But Milan soon rose from her ashes; and the league of Lombardy was cemented by distress: their cause was espoused by Venice, Pope Alexander the Third, and the Greek emperor: the fabric of oppression was overturned in a day; and in the treaty of Constance, Frederic subscribed, with some reservations, the freedom of four-and-twenty cities.

His grandson contended with their vigor and maturity; but Frederic the Second was endowed with some personal and peculiar advantages.