The 7th verse of Jigjivanpur Inscription, literally says "Vijitya Samare Tan Imdraraha Adhikari Sindhunam Adhipa"
Translating:
"He defeated the otherwise invincible sovereigns like Indraraia. In a trice
he pounded the king of the Sindhu country (in battle)"
The Kitāb an-Nibrās fi Ta'rikh Khulafä' Bani al-Abbās of Ibn Dihyah al-Kalbi, a well-known Spanish author of the seventh century A.H. (13th century A.D.)
If anyone wants to read the letters between Mamun & Dharma (Authenticity yet to be proven), can surely check it out.
Sinha concludes that Dharmapala was an emperor of extensive domains which had Bengal, Bihar, U.P., Punjab, Berar,
E.Rajputana, Sindh & probably Saurashtra. The kings of which had been paying homage to the might Emperor.
The 7th verse of Jigjivanpur Inscription, literally says "Vijitya Samare Tan Imdraraha Adhikari Sindhunam Adhipa"
Translating:
"He defeated the otherwise invincible sovereigns like Indraraia. In a trice
he pounded the king of the Sindhu country (in battle)"