Their king slain and no will to follow, the French nobleman Baron Aigeus d'Airan was elected head of a regency council composed of twenty senior lords and court-men. Baron Aigeus' reign inaugurated the Aigeun period of French history, spanning his Regency amid the turmoil of the English war and growing nationalistic sentiment in Occitania, the southern provinces of France, and the rebellious streaks of numerous duchies throughout France. Aigeus descended from Crusader knights, like the pretender Guillaume, though was not versed in combat himself: he was a statesman, negotiating between the different influences affecting French politics - the church, the nobility, the military and the people - to further his own agenda. Aigeus sought to crown himself and the d'Airan family kings of France, writing in his diaries;
"What does a man want but the apex of power, the velvet fur of a crown and the subjected millions praising his name? I am a man above all, and this is my unvanquished desire."
Nonetheless, Baron Aigeus never revealed his grand ambitions or ever acted to consolidate them: with France focused wholly on the war effort, political reforms could not be instituted. Despite private agitations favouring the conclusion of war, the jingoistic frenzy whipped up by Charles VI in his noblemen prevented any sort of peace settlement in which Gascony and Calais were not returned to their rightful dominion of France. Baron Aigeus presided over the French throne for the 2-year-old heir, Charles de Valois, whose illegitimate heritage as the bastard son of Charles VI and a peasant girl infatuated with the monarch was concealed, who demonstrated promise from a young age in mathematics. Aigeus acted as a substitute father for Charles, devoting much of his free time talking to his nurses and observing the child; if anything, he was a greater parent than the heir's namesake.
With Charles' assassination leaving the French army in disarray, the first English force - numbering 14,000 - landed in Normandy and retook the province by July 1405. The French were concencrated in Brittany, which was slowly being subjugated by the French crown after its army's crushing defeat: with a beach-head established, England rushed to its ally's defence. The 15,000-strong Armee Royale was commanded by France's chief military leader, Jean II Le Meingre, who after hearing of the English siege of French-controlled Armor directed his forces to the city. With a slight numerical advantage and the controversial deployment of halberdiers, Le Meingre's attack suffered from logistical failures that ultimately led to the Armee Royale's decimation by Hallowen. Baron Aigeus was enraged by Le Meingre's meek leadership, though nonetheless left him to lead the reconstruction of the Armee Royale - as was completed by April 1406.
In the interval, Aigeus negotiated a favourable peace with the Breton king Charles de Vitre that ceded Armor and Finistere directly to the French crown. Aigeus' urgency for peace came after the English Royal Army liberated Finistere, narrowing France's negotiating room with the Bretons. Additionally, Aigeus' cousin Guillaume d'Airan recruited a 5,000-man halberdier army responsible for Occitania. d'Airan routed a small Portuguese army that crossed the Pyrenees into Toulouse in August 1406.
In the same month, the French heir Charles was poisoned. Aigeus reportedly collapsed at the child's bedside, and sent for a doctor immediately; however, the medician was of no use. On Friday 22nd July 1406, Charles was pronounced dead. As the French court recorded its shock, it was not aware of the great mutilation that would befall the body.