Delafosse, one of the earliest enquirers into Fulani history and customs, principally relying on oral tradition, estimated that Fulani migrants left Fuuta-Tooro, and Macina, towards the east, between the eleventh and the fourteenth centuries. By the 15th century, there was a steady flow of Fulɓe immigrants into Hausaland and, later on, Bornu. Their presence in Baghirmi was later recorded when Fulani fought as allies, to Dokkenge or Birni Besif, when he founded Massenya (a Chadian town), early in the 16th century.