State Bank of India is India's largest and oldest government bank.Do you know the old name of State Bank of India?.Actually, SBI was known by some other name 60 years ago.SBI, before and after independence, was known as the Imperial Bank.However, in 1955 its name was changed to State Bank of India.Imperial Bank was nationalized and renamed as SBI.During the British era, the Imperial Bank was also formed by the merger of 3 banks.On 1 July 1955, the Imperial Bank came to be known as the State Bank of India.After 1959, 8 former banks associated with the state also became subsidiaries of SBI