Explanation:

- The Treaty of Alinagar was signed in 1757 between the British East India Company and Siraj-ud-Daula.

- Siraj-ud-Daula was the Nawab of Bengal at that time.

- The treaty restored British trading privileges and allowed them to fortify Calcutta.

- Mir Qasim was a later Nawab of Bengal known for his conflicts with the British.

- Alivardi Khan preceded Siraj-ud-Daula and was involved in earlier conflicts with Marathas.

- Mir Jafar was installed as Nawab by the British after the Battle of Plassey.