Explanation:

- Kushans:

- The Kushans adopted the title "King of Kings," or "Shahanshah," which indicates a ruling king over other subordinate kings. This title was commonly used in Central Asia and parts of India under their rule.

- Shakas:

- Although the Shakas were known for their invasions and rule in parts of India, there is no strong historical evidence that they used the title "King of Kings." They were one of the groups of Indo-Scythians.

- Pratiharas:

- The Pratiharas were one of the prominent dynasties during early medieval India, but they did not use the title "King of Kings." They are known more for their influence in the Gurjara-Pratihara Empire.

- Mauryas:

- The Mauryas, being one of the largest and most powerful ancient Indian empires, did not typically use the title "King of Kings." They are known for having rulers like Ashoka, who adopted other titles and principles like "Devanampriya" (Beloved of the Gods).