Just sticking to Mahabharata for the moment
Refer Mausala Parva
, where it's described that Rukmini, Jambavati, Bhadra, Kalindhi & Mitravindya ascended a funeral pyre, while the others - Satyabhama, Lakshmanaa & Satya - retired to a place in the Himalayas called Kalpa.
In one Bengali traslation by Rajshekar Basu, it's described that the other 16,000 wives drowned themselves in the river Saraswati. Also, nowhere in the Mahabharata is Krishna described as being monogamous.
In Vana Parva
, Satyabhama's conversation w/ Draupadi is described.
In Udyog Parva
, Rukmini's marriage to Krishna is briefly alluded to in the chapter where Rukmi attempts to join the Pandavas, and then the Kauravas.
Only thing - I used to think that Rukmi being rejected as an ally by first Arjun, and then Duryodhan, was there in the Mahabharata, but I can't find it anywhere in Udyog Parva.
Edited by .Vrish. - 25 January 2012 at 11:49am