In 1756 the old nawab died, and was succeeded by his grandson Surajud-Dowlah, a young madman of 19, whose name is indelibly associated with the tragedy of the Black Hole.
His pecuniary bargains with Shuja-ud-Dowlah, the nawab wazir of Oudh, stand on a different basis.
ASAF-' 'UD-DOWLAH, nawab wazir of Oudh from 1775 to 1797, was the son of Shuja-ud-Dowlah, his mother and grandmother being the begums of Oudh, whose spoliation formed one of the chief counts in the charges against Warren Hastings.
When Shuja-ud-Dowlah died he left two million pounds sterling buried in the vaults of the zenana.
Ali Vardi Khan died in 1756, and was succeeded by his grandson, Suraj-ud-Dowlah, a youth of only nineteen years, whose ungovernable temper led to a rupture Black Hole of Calcutta.
Suraj-ud-Dowlah, exasperated by this breach of neutrality within his own dominions, took the side of the French.
After a few rounds of artillery fire, Suraj-ud-Dowlah fled, and the road to Murshidabad was left open.
Ever since the nawab wazir, Shuja-ud-Dowlah, received back his forfeited territories from the hands of Lord Clive in 1765, the very existence of Oudh as an independent state had depended only upon the protection of British bayonets.
Calcutta was retaken by Clive and Admiral Watson on the 2nd of January 1757, and on the 23rd of June, Suraj-ud-Dowlah, routed at Plassey, fled to Rajmahal, where he was captured.
He was put to death on the 4th of July 1757 at Murshidabad, by order of Miran, son of Mir Jafar, who had conspired against Suraj-ud-Dowlah and had been present at Plassey without taking part in the battle.
Having been driven into the mountains by the Mahrattas, they had appealed for aid to Shuja-ud-Dowlah, wazir of Oudh, and ally of the British.