The first chairman, elected unanimously, was Sachchidananda Sinha, in capacity of a temporary chairman.
Basis of his election was his age! Well known Jurist and Barrister from Bihar, he was the oldest member of the assembly.
Rules and procedure for the permanent chairman of the Constituent Assembly were agreed upon unanimously by the Assembly members.
The first nomination was for Dr. Rajendra Prasad (member-Bihar), proposed by J B Kriplani (member-United Province) and Seconded by Vallabhbhai Patel (member- Gujarat)
3. The third nomination was also for Dr. Rajendra Prasad (member-Bihar), proposed by T Prakasam Pantulu (member-Madras)
Prasad was thus elected unopposed to become the chairman of the Constituent Assembly, on 11-Dec-1946.
He was conducted to chair by A K Azad and J B Kriplani
And it was apt. Dr. Radhakrishnan, naturally the best orator that India has produced so far in the modern times, broke out extempore in a rousing speech quoting
Two of those who proposed Prasad’s nomination went on to become chief ministers:
Prakasam Pantulu, the first CM of AP
Harekrishna Mehtab as the first CM of Orissa