Wikipedia
The Oretani or Oretanii ( Greek: Orissioi) were a pre- Roman ancient Iberian people (in the geographical sense) of the Iberian Peninsula (the Roman Hispania), that lived in today's northeastern Andalusia, in the high Baetis ( Guadalquivir) river valley, eastern Marianus Mons ( Sierra Morena), and the southern area of today's La Mancha.
They could have been an Iberian tribe, a Celtic one, or a mixed Celtic and Iberian tribe or tribal confederacy (and hence related to the Celtiberians).
The Mantesani/ Mentesani/ Mantasani of today's La Mancha and the Germani (of Oretania) in eastern Marianus Mons ( Sierra Morena) and west Jabalón river valley sometimes are included in the Oretani but it is not certain if they were Oretani tribes.