Explanations:The question asks about the contemporary ruler of Devapala of Bengal. To understand this, we need to delve into the historical context of the Pala Empire and the rulers of the Kamarupa kingdom in Assam.
Devapala was a prominent ruler of the Pala Empire, which was a powerful dynasty that ruled parts of Bengal and Bihar in the 9th century CE. His reign is estimated to have been from around 810 to 850 CE. During this period, the Pala Empire was at its zenith, and Devapala was known for his military campaigns and administrative reforms.
Contemporaneous rulers are those who ruled in different regions during the same time period. In the context of the Kamarupa kingdom, which was located in present-day Assam, Hajjara Varman was a significant ruler. The Kamarupa kingdom was an important political entity in northeastern India, and it had interactions with the Pala Empire.
Hajjara Varman ruled the Kamarupa kingdom during the 9th century CE, which overlaps with the reign of Devapala of Bengal. This makes Hajjara Varman a contemporary of Devapala. The Kamarupa kingdom was known for its cultural and political influence in the region, and Hajjara Varman was one of the rulers who contributed to this legacy.
It is important to note that the other options provided in the question do not align with the historical records of the time period. Salambha, associated with the Haihaya dynasty, and Van Mala Varman are not known to have ruled during the same period as Devapala. Paralambha is not a recognized historical figure in this context.
Thus, the correct answer is Hajjara Varman, as he was a contemporary ruler of Devapala of Bengal, both ruling during the 9th century CE in different parts of northeastern India.