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This paper returns to examining the concept of fidelity, which is central to Carolingian political ideology and relationships within the aristocracy. It looks at the example of Bégon and Bérenger, two faithful followers of Louis the Pious who definitely succeeded one another as heads of the earldom of Toulouse. It is important to understand the basis of this unfailing fidelity at a time of decreasing fidelity among the powerful. Although family ties and friendship linking these two counts to Louis the Pious partially account for this, the force of the ideology of service, which grew within the entourage of the early Carolingian kings, should not be disregarded. Fidelity was also a way for them to accede to the highest level of power. Indeed, these two counts had considerable responsibility at the heart of the Regnum of Aquitaine as Counts of Toulouse, while having a primary role at court. However, their rise was not only the result of their loyalty, but also of Louis the Pious’s desire to have sufficiently powerful agents to apply his military and religious policy effectively. In this, Louis the Pious showed good, clear political sense. These two counts were particularly active agents in the monastic renewal and the defense of the southern borders of the Kingdom of Aquitaine. For his part, Bérenger contributed to upholding the authority of Louis the Pious in the Midi against the machinations of King Pépin I and Bernard de Septimanie.