1769 J. Brown Dict. Bible II. 381/2The three kingdoms..conquered by Cyrus and his Medo-Persian troops. 
1835 J. B. Robertson tr. Schlegel'sPhilos. ofHist. I. vii. 272The Assyro-Babylonian empire which preceded the Medo-Persian. 
1869 G. Rawlinson Man. Anc. Hist. ii. 9A revolution in the Medo-Persian capital. 
1875 Encycl. Brit. I. 604/2The name for God in Medo-Scythic is Annap. 
1899 Captain Apr. 96/2 There are certain Medo-Persian laws pertaining to a successful stamp collection. 
1938 Times Lit. Suppl. 1 Jan. 14/2For a long period the technique of American journalism has been almost Medo-Persian in its rigidity. 
ORIGIN: from Latin  Medus  from Greek  Mēdos , from Medoi : see Mede -o- 
Medo-
Prefix
- pertaining to Media, especially as a political entity
Etymology
Shortened unetymologically from Media in compounds- 20th century formation, perhaps echoing terms like Afro-, Indo-, Sino- etc.