Reer Bicidyahan[2] is a nickname for people descended from Ali bin Ibrahim ibn Jibril There is no clear agreement on the clan and sub-clan structures and many lineages are omitted.

[3][4] The Bicidyahan sub-clan trace their origins back to a late 16th century ancestor, Cali Ibrahim, who is buried in the present day Qandala District of Bari, Puntland.

By the late 17th century, the Bicidyahan had crossed Nugaal into Mudug, joining the southern Majeerteen sub-clans of Idigfacle, Gumasoor, Amaanle and Abdalla Nolays.

These, frightened by the strange noise that the strips of skin dragged by the running horses made echo in the great plain, believed they were attacked and ran away, abandoning their base" [8] After this final battle, the fleeing Galla were hacked down and Sultan Farax Cisman was henceforth given the nickname of Gallaeri(expeller of pagans), a name that survives within the Bicidyahan sub-clan that descend from him.

In revenge for the Merrehans, Rer Bicidyahan and Omàr Mahmud, chased the Ogadén and inflicted on them such a defeat at the wells of Wardheer that the Ugas or head of the Ogadèn Fara Addò also fell – the survivors sheltered in Gorrahèi to not be exterminated.