Explanation

Aga Khan III led the Simla delegation of 1906.

They took place on 1st Oct 1906.

Here Lord Minto met with a delegation of 35 Muslim leaders led by Aga Khan 

Additional information:

The Simla deputation proved a landmark in the history of modern India,

Because for the very first time the Hindu-Muslim conflict, 

Which started with the Urdu-Hindi controversy was lifted to the constitutional plane.