Irda copper plate addresses king Rajyapala with the epithet of Kamboja-Vamsa-Tilaka (i.e. the ornament of the Kamboja family).
Rajyapalal ultimately carved out an independent kingdom in north Bengal when the Pala power weakened in the second half of the tenth century CE (a situation similar to that of the Western Roman Empire and the foederati).
[11] The Bhaturya Inscriptions refers to a ruler named Rajyapala whose commands are obeyed by the Mlechchas, Angas, Kalingas, Vangas, Odras, Pandyas, Karnatas, Latas, Suhma, Gurjaras, Kiratass and in Cina.
[12] According to George E Somers, "while the claim is certainly exaggerated, it is significant that Rajyapala's conquests included Anga, Vanga, Suhma, but not Gauda or Pundra".
[13][14][15][16] According to some scholars including George E Somers, it is also possible that the Rajyapala of Bhaturiya inscriptions was a camp-follower of the Rashtrakuta army on march in the south and north and that this Rajyapala was a General of Kamboja origin and accompanied the Rashtrakuta ruler in his march into Bengal; and later carved out an independent Kamboja Pala kingdom in northern Bengal, probably during the reign of Gopala-II.
Some scholars tend to link Kamboja-Vamsa-Tilaka Rajyapala of the Irda copper plate with this Kambojanvaya Gaudapati of Dinajpore pillar inscriptions.