Analysis of information sources in references of the Wikipedia article "Dharmapala of Bengal" in English language version.
Dharmapāla after defeating Indrāyudha and capturing Kanuaj made it over to Cakrāyudha, who was a vassal king of Kanuaj subordinate to Dharmapāla ... Dharmapāla was thus acknowledged paramount ruler of almost whole of North India as the Bhojas of Berar, Kīra (Kangra district), Gandhāra (West Punjab), Pañcāla (Ramnagar area of U.P.), Kuru (eastern Punjab), Madra (Central Punjab), Avanti (Malwa), Yadus (Mathura or Dwarka or Siṁhapura in the Punjab), Matsya (a part of northeast Rajputana) were his vassals.
A temple (deva-kula) of the god Nanna-Narayana is referred to in a record of Dharmapala (B.2), while the Garuda Pillar Inscription at Badal (B. 20) shows its continued importance, during the reign of Narayanapala.
It is also stated in the Svayambhu Purana that Nepal also was a vassal state of Dharampala.