 The absence of Frankish literature sources suggests that the Frankish language was forgotten rather rapidly after the early stage of the dynasty.Hen believes that for Neustria, Burgundy and Aquitania, colloquial Latin remained the spoken language in Gaul throughout the Merovingian period and remained so even well in to the Carolingian period.However, Urban T. Holmes estimated that a Germanic language was spoken as a second tongue by public officials in western Austrasia and Neustria as late as the 850s, and that it completely disappeared as a spoken language from these regions only during the 10th century.