Who were the signatories of Treaty of Allahabad?

The signatories of the Treaty of Allahabad were as follows:

• Shah Alam II, son of the late Mughal Emperor Alamgir II

• Robert Clive of the East India Company

The treaty was signed as a result of the Battle of Buxar which saw the defeat of Shah Alam II and his allies.

For further reading check the following articles:

• Battle of Buxar
• Robert Clive 
• European Colonialism