Rai dynasty in the context of "Brahmin dynasty of Sindh"

Sukkur is a city in the Pakistani province of Sindh along the western bank of the Indus River, directly across from the historic city of Rohri. Sukkur is the third largest city in Sindh after Karachi and Hyderabad, and 17th largest city of Pakistan by population. The city was originally founded by the Rai dynasty of Sindh. The modern city was built in the 1840s. New Sukkur was established during the British era alongside the village of Sukkur. Sukkur's hill, along with the hill on the river island of Bukkur, form what is sometimes considered the "Gate of Sindh".

The Battle of Rasil (Sindhi: راسل جي جنگ) was fought between the Rashidun Caliphate and the Rai kingdom ruled by Raja Rasil in early 640 ad. It was the first encounter of the Rashidun Caliphate in the Indian subcontinent. The exact location of the battle is not known, but historians suggest it was fought on the western bank of the River Indus.

Suhail ibn Adi was given command of this expedition by Caliph Umar. Suhail marched from Busra in 639 ad. He eventually reached Makran, in present-day Pakistan. It had been a traditional territory of Sassanids for centuries but was then a domain of the Rai Kingdom, who had annexed it in 636-637 although they had acted as a vassal of Sassanid Persians in past.