Hunald was forced at the outset of his reign to accept the authority of the mayor of the palace Charles Martel, but he tried three times to throw it off in open revolt (736, 742 and 745).[5] The Aquitanian province that he inherited had been enlarged by his father (and possibly earlier ancestors also) to include territory along the Loire that had once been Neustrian and the Auvergne region that had been Austrasian.The purpose of this expedition seems to have been to take advantage of the death of Odo to alter the constitutional status of Aquitaine in the Frankish kingdom by forcing Hunald to recognise his lordship and to remit taxes (munera) to the royal government.[3][6] The Vita Pardulfi, the late 8th-century life of Pardulf (died 737), records that Hunald succeeded his father as princeps, a term with royal connotations, and later served Charles as legatus.Despite achieving a crushing victory over the Umayyads at the battle of the River Berre in 737, Charles never besieged Narbonne, possibly because Hunald was threatening his lines of communication.Overwhelming the Romans[b] they made for Bourges, the outskirts of which they set on fire; and as they pursued the fleeing Duke Chunoald they laid waste as they went.[13] In the autumn of 742, after Carloman and Pippin had left, Hunald crossed the Loire in support of Duke Odilo of Bavaria's ongoing revolt.According to the Annales Mettenses priores, Hunald knew that he could not resist and so swore an oath to obey their "every will" (omnem voluntatem), gave hostages and remitted the taxes owed.[7] In the words of the Annales Mettense, he, "taking off the crown on his head and swearing a monk's vow, entered the monastery that is on the isle of Ré".