Robert Clive, the British East India Company’s commander, won over Mir Jafar in a secret pact, promising him the Nawab of Bengal’s throne.
Who Was Mir Jafar? The British Rewarded His Betrayal With The ‘Nawab Of Bengal’ Title

Robert Clive, the British East India Company’s commander, won over Mir Jafar in a secret pact, promising him the Nawab of Bengal’s throne.