Before becoming the staunch advocate for a separate Muslim nation, Quaid-e-Azam Muhammad Ali Jinnah was famously known by what title, reflecting his early efforts to foster Hindu-Muslim unity?

Explanation

Gopal Krishna Gokhale, a prominent Indian nationalist, famously referred to Muhammad Ali Jinnah as the 'Ambassador of Hindu-Muslim Unity' due to his tireless efforts to bridge the gap between the two communities, especially exemplified by the Lucknow Pact of 1916.