Seeta Aur Geeta
This Tamil film was remade as "Ram Aur Shyam" starring Dilip Kumar in the leading dual role , which inspired Salim-Javed to write "Seeta Aur Geeta" , but they subverted the formula by having the heroine eventually become the "hero" while the male lead is in a mostly supporting role . 
<triplet> Ram Aur Shyam <subj> Dilip Kumar <obj> cast member