Early in the Empire's history, Louis the Pious formally established the supremacy of the Empire over Catholic kingdoms through the document issued in 817 and later known as "Ordinatio Imperii". The view at the time was that the Empire covered all Western Christendom under one authority. (The British Isles, Brittany, and the Kingdom of Asturias were omitted in this vision.) Under Louis's arrangement, only his elder son Lothair would hold the title of Emperor, and Lothair's younger brothers Pepin and Louis should obey him even though they were kings, respectively, of Aquitaine and Bavaria. That document was controversial from the start, however, not least as it did not conform to Frankish succession law and practices. Following Louis the Pious's death in June 840, the Battle of Fontenoy (841), Oaths of Strasbourg (842) and Treaty of Verdun (843) established a different reality, in which the Imperial title remained undivided but its holder competed with kings for territory, even though at the time all were still bound by the family links of the Carolingian dynasty and the bounds of Catholic Christianity.