Q. Who was given the title of "The Ambassador of Hindu-Muslim Unity" for being the architect and mastermind of the historic Lucknow Pact?
Answer: Muhammad Ali Jinnah
Notes: Muhammad Ali Jinnah advocated Hindu–Muslim unity in early years of his political career. Gopal Krishna Gokhale stated that Jinnah has true stuff in him, and that freedom from all sectarian prejudice which will make him the best ambassador of Hindu–Muslim Unity"