"Let them come forward, they are thirsty for the sight of a King," said Henri IV to his followerswho were trying to push back the curious crowds as he entered Paris in February, 1594. It is perhaps to be regretted that seven kings (to say nothing of two emperors) have since more than quenched the French's taste for royalty, because they have long been in need of - and periodically have sought - a symbol of national unity. Modem-day France has had...