THE ARTABATITAI (or Artabititae) were a tribe of four-legged African men who roved around on all fours like animals.

Pliny the Elder, Natural History 6. 195 (trans. Rackham) (Roman encyclopedia C1st A.D.) :
"Then come regions [in Africa] that are purely imaginary: towards the west [of the Aithiopian kingdom of Meroe] are . . . the Artabatirae, who have four legs and rove about like wild animals."

Sources:

• Pliny the Elder, Natural History - Latin Encyclopedia C1st A.D.