Ever since the days of the Roman Empire, when Paris prospered through extensive river trading and expanded to the Left Bank, the Seine has been a great commercial artery, linked by canals to the Loire, Rhine, and Rhône rivers. Officially established as the capital city by Clovis, king of the Franks (who defeated the Roman governor of Gaul and established the Merovingian dynasty), Paris evolved into a cultural center and a showcase of glorious architecture. It is appropriate that the center of Paris particularly that section gracing the Seine around Ile de la Cité and Ile Saint-Louis features some of the city's oldest and most majestic historic monuments. For the past half-century, perhaps one of the most relaxing and expedient ways to view these sights in all their grandeur has been from the glass-covered decks of the Bateaux-Mouches, those unique long-boats leisurely plying the Seine, from whose vantage point millions of tourists have acquired their considerable appreciation for all that Paris has to offer. On some days, the sheer volume of this boat traffic resembles an invasion of a different kind, albeit one of camera shutters and tourists gazing in wonderment.