Q. Which Pratyahara king was titled as 'Pramana'?
Answer: Mihirbhoj
Notes: Mihir Bhoja (836-885 A.D), the most powerful ruler of Gujara-Pratihara dynasty, was a devotee of Vishnu and adopted the title of Adivaraha (the fortunate primeval boar incarnation of Vishnu) which is inscribed on some of his coin. He succeeded his father Ramabhadra and was one of the outstanding figures of India in ninth century. He eventually took the title of 'Pramana'.