New Delhi, April 14 (ANI): Nation paid tribute to chief architect of the Indian constitution, Dr. BR Ambedkar on his 123rd birth anniversary on Monday. Prime Minister Manmohan Singh, President Pranab Mukherjee, and Vice-President Hamid Ansari paid floral tribute to Ambedkar in New Delhi. Lok Sabha Speaker Meira Kumar and diplomat Devyani Khobragade were also present at the event among many others. Dr. Ambedkar was born in 1891 in the town of Mhow in Madhya Pradesh and was independent India's first law minister and principal architect of the Constitution of India.