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SB 10.90.30
tasam stri-ratna-bhutanam
astau yah prag udahrtah
rukmini-pramukha rajams
tat-putras canupurvasah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Among these jewellike women were eight principal queens, headed by Rukmini. I have already described them one after another, O King, along with their sons.