In some stories Conchobar's birth and death are synchronised with those of Christ, which creates an apparent anachronism in the presence of the Connachta. The historical Connachta were a group of dynasties who traced their descent to the legendary king Conn Cétchathach, whose reign is traditionally dated to the 2nd century. However, the chronology of early Irish historical tradition is inconsistent and highly artificial. One early saga makes Fergus mac Léti, one of Conchobar's predecessors as king of the Ulaid, a contemporary of Conn, and Tírechán's 7th century memoir of Saint Patrick says that Cairbre Nia Fer, Conchobar's son-in-law in the sagas, lived only 100 years before the saint, i.e. in the 4th century.