Following this period came the time when France was ruled by the mayors of the palace who, owing to the weakness of the sovereigns, gradually assumed the whole of the royal power. After Charles Martel, the most famous of these mayors, had defeated the Saracens at Tours, came his son Pepin-le-Bref, the father of Charlemagne. Childeric, the last of the Merovingian kings, had been put out of the way in a monastery and Pepin had become the King of France. Charlemagne, however, soon made himself greater still as Emperor of an enormous portion of Europe--France, Italy, and Germany all coming under his rule. At his death Charlemagne divided his empire. His successor Louis le Debonnaire, owing to his easy-going weakness, fell a prey to Charlemagne's other sons, and at his death, Charles the Bald became King of France and the country west of the Rhine. The other portions of the empire falling to Lothaire and the younger Louis. During all this period, France had suffered from endless fighting and the famines that came as an unevitable consequence, and just about this time Neustria suffered still further owing to the incursions of the Danes. Even in Charlemagne's time the black-sailed ships of the Northmen had been seen hovering along the coast near the mouth of the Seine, and it has been said that the great Emperor wept at the sight of some of these awe-inspiring pirates. In the year 841 the Northmen had sailed up the Seine as far as Rouen, but they found little to plunder, for during the reign of the Merovingian kings, the town had been reduced to a mere shadow of its former prosperity. There had been a great fire and a great plague, and its ruin had been rendered complete during the civil strife that succeeded the death of Charlemagne. Wave after wave came the northern invasions led by such men as Bjorn Ironside, and Ragnar Lodbrog. Charles the Bald, fearing to meet these dreaded warriors, bribed them away from the walls of Paris in the year 875. But they came again twelve years afterwards in search of more of the Frenchmen's gold. When Charles the Fat, the German Emperor, became also King of France, he had to suffer for his treacherous murder of a Danish chief, for soon afterwards came the great Rollo with a large fleet of galleys, and Paris was besieged once more. Odo, Count of Paris, held out successfully, but when the king came from Germany with his army, instead of attacking the Danes, he induced them to retire by offering them a bribe of 800 lbs. of silver. Before long Odo became King of France, but after ten years of constant fighting, he died and was succeeded by Charles the Simple. This title does an injustice to his character, for he certainly did more for France than most of his predecessors. Finding the Northmen too firmly established in Neustria to have any hope of successfully driving them out of the country, he made a statesmanlike arrangement with Rollo. The Dane was to do homage to the French king, to abandon his gods Thor,