And thus, while
the luxury of Rome consumed the wealth of her provinces, her
uncommercial policy dried up the sources of its continuance. Nor were
the inestimable advantages of commerce the sole motives of Henry. All
the ardour that the love of his country could awaken conspired to
stimulate the natural turn of his genius for the improvement of
navigation.

As the kingdom of Portugal had been wrested from the Moors, and
established by conquest, so its existence still depended on the
superiority of force of arms; and even before the birth of Henry, the
superiority of the Portuguese navies had been of the utmost consequence
to the protection of the state. Whatever, therefore, might curb the
power of the Moors, was of the utmost importance to the existence of
Portugal. Such were the views and circumstances which united to inspire
the designs of Henry, designs which were powerfully enforced by the
religion of that prince. Desire to extirpate Mohammedanism was
synonymous with patriotism in Portugal. It was the principle which gave
birth to, and supported their monarchy. Their kings avowed it; and
Prince Henry always professed, that to propagate the Gospel and
extirpate Mohammedanism, was the great purpose of all his enterprises.
The same principles, it is certain, inspired King Emmanuel, under whom
the eastern world was discovered by Gama.[42]

The crusades, which had rendered the greatest political service to Spain
and Portugal, had begun now to have some effect upon the commerce of
Europe. The Hanse Towns had received charters of liberty, and had united
together for the protection of their trade against the pirates of the
Baltic. The Lombards had opened a lucrative traffic with the ports of
Egypt, from whence they imported into Europe the riches of India; and
Bruges, the mart between them and the Hanse Towns, was, in consequence,
surrounded with the best agriculture of these ages,[43] a certain proof
of the dependence of agriculture upon the extent of commerce. The Hanse
Towns were liable, however, to be buried in the victories of a tyrant,
and the trade with Egypt was exceedingly insecure and precarious. Europe
was still enveloped in the dark mists of ignorance; commerce still
crept, in an infant state, along the coasts, nor were the ships adapted
for long voyages. A successful tyrant might have overwhelmed the system
of commerce entirely, for it stood on a much narrower basis than in the
days of Phoenician and Greek c