It started with BJP member Prabhat Jha's query during the Question Hour, seeking details about the development of Bihar's Sitamarhi, which he said was not a "disputed" birthplace. In response, Culture Minister Mahesh Sharma told the Rajya Sabha that Sita's birthplace was "a matter of faith" - an opening that was promptly taken up senior Congress leader Digvijaya Singh.
"To say that the birthplace of Sita was a matter of faith shows that it 'does not rely on direct evidence'," Mr Singh said, pointing out that it was the same sort of response that the BJP had objected to, when it was made by the Congress-led government in the matter of "Ram Setu" between India and Sri Lanka.
The minister, however, defended his written reply, claiming there was no question mark over the birthplace of Sita and he had said in his response that the Valmiki Ramayana mentions it.
Mr Singh then demanded an apology from Mr Sharma. Other opposition members including Jaya Bachchan of the Samajwadi Party, JD(U) lawmaker Anil Kumar Sahani and Ambika Soni of Congress joined in.