[4][5] Raja Dahir was born in 663 CE into the Brahman dynasty of Sindh, a family deeply rooted in Hindu traditions and governance.
His father, Chach of Aror, who ruled from 631 to 671 CE, was a Brahmin who ascended to the throne after marrying the widowed Queen Suhandi.
It will be heard by other kings in the world, and it will be said that Raja Dahir of Sindh sacrificed his precious life for the sake of his country, in fighting with the enemy.
"[12]The primary reason cited in the Chach Nama for the expedition by the governor of Basra, Al-Hajjaj ibn Yusuf, against Raja Dahir, was a pirate raid off the coast of Debal resulting in gifts to the caliph from the king of Serendib (modern Sri Lanka) being stolen.
In 711, bin Qasim attacked at Debal and, on orders of Al-Hajjaj, freed the earlier captives and prisoners from the previous (failed) campaign.
From Debal, bin Qasim moved on to Nerun for supplies; the city's Buddhist governor had acknowledged it as a tributary of the Caliphate after the first campaign and capitulated to the second.
After Dahir was killed in the Battle of Aror on the banks of the River Indus, his head was cut off from his body and sent to Hajjaj bin Yousuf.