To resist all this the high Catholic party framed the League they had long been meditating; it is said that the Cardinal de Lorraine had sketched it years before, at the time of the later sittings of the Council of Trent. Lesser compacts had already been made from time to time; now it was proposed to form one great League, towards which all should gravitate. The head of the League was Henri, Duc de Guise the second, "Balafre," who had won that title in fighting against the German reiters the year before, when they entered France under Condo. He certainly hoped at this time to succeed to the throne of France, either by deposing the corrupt and feeble Henri III., "as Pippin dealt with Hilderik," or by seizing the throne, when the King's debaucheries should have brought him to the grave. The Catholics of the more advanced type, and specially the Jesuits, now in the first flush of credit and success, supported him warmly. The headquarters of the movement were in Picardy; its first object, opposition to the establishment of Conde as governor of that province. The League was also very popular with the common folk, especially in the towns of the north. It soon found that Paris was its natural centre; thence it spread swiftly across the whole natural France; it was warmly supported by Philip of Spain. The States General, convoked at Blois in 1576, could bring no rest to France; opinion was just as much divided there as in the country; and the year 1577 saw another petty war, counted as the sixth, which was closed by the Peace of Bergerac, another ineffectual truce which settled nothing. It was a peace made with the Politiques and Huguenots by the Court; it is significant of the new state of affairs that the League openly refused to be bound by it, and continued a harassing, objectless warfare. The Duc d'Anjou (he had taken that title on his brother Henri's accession to the throne) in 1578 deserted the Court party, towards which his mother had drawn him, and made friends with the Calvinists in the Netherlands. The southern provinces named him "Defender of their liberties;" they had hopes he might wed Elizabeth of England; they quite mistook their man. In 1579 "the Gallants' War" broke out; the Leaguers had it all their own way; but Henri III., not too friendly to them, and urged by his brother Anjou, to whom had been offered sovereignty over the seven united provinces in 1580, offered the insurgents easy terms, and the Treaty of Fleix closed the seventh war. Anjou in the Netherlands could but show his weakness; nothing went well with him; and at last, having utterly wearied out his friends, he fled, after the failure of his attempt to secure Antwerp, into France. There he fell ill of consumption and died in 1584.
This changed at once the complexion of the succession question.
Hitherto, though no children seemed likely to be born to him, Henri III. was young and might live long, and his brother was there as his heir.
Now, Henri III. was the last Prince of the Valois, and Henri of Navarre in hereditary succession was heir presumptive to the throne, unless the Salic law were to be set aside. The fourth son of Saint Louis, Robert, Comte de Clermont, who married Beatrix, heiress of Bourbon, was the founder of the House of Bourbon. Of this family the two elder branches had died out: John, who had been a central figure in the War of the Public Weal, in 1488; Peter, husband of Anne of France, in 1503; neither of them leaving heirs male. Of the younger branch Francois died in 1525, and the famous Constable de Bourbon in 1527. This left as the only representatives of the family, the Comtes de La Marche; of these the elder had died out in 1438, and the junior alone survived in the Comtes de Vendome. The head of this branch, Charles, was made Duc de Vendome by Francois I. in 1515; he was father of Antoine, Duc de Vendome, who, by marrying the heroic Jeanne d'Albret, became King of Navarre, and of Louis, who founded the House of Conde; lastly, Antoine was the father of Henri IV. He was, therefore, a very distant cousin to Henri III; the Houses of Capet, of Alencon, of Orleans, of Angouleme, of Maine, and of Burgundy, as well as the elder Bourbons, had to fall extinct before Henri of Navarre could become heir to the crown. All this, however, had now happened; and the Huguenots greatly rejoiced in the prospect of a Calvinist King. The Politique party showed no ill-will towards him; both they and the Court party declared that if he would become once more a Catholic they would rally to him; the Guises and the League were naturally all the more firmly set against him; and Henri of Navarre saw that he could not as yet safely endanger his influence with the Huguenots, while his conversion would not disarm the hostility of the League. They had before, this put forward as heir to the throne Henri's uncle, the wretched old Cardinal de Bourbon, who had all the faults and none of the good qualities of his brother Antoine. Under cover of his name the Duc de Guise hoped to secure the succession for himself; he also sold himself and his party to Philip of Spain, who was now in fullest expectation of a final triumph over his foes. He had assassinated William the Silent; any day Elizabeth or Henri of Navarre might be found murdered; the domination of Spain over Europe seemed almost secured. The pact of Joinville, signed between Philip, Guise, and Mayenne, gives us the measure of the aims of the high Catholic party. Paris warmly sided with them; the new development of the League, the "Sixteen of Paris," one representative for each of the districts of the capital, formed a vigorous organisation and called for the King's deposition; they invited Henri, Duc de Guise, to Paris. Soon after this Henri III. humbled himself, and signed the Treaty of Nemours (1585) with the Leaguers. He hereby became nominal head of the League and its real slave.