Where was God Shiva conceived. ??
Shiva is Poorvaja, who is existing from days of yore ( Aadi).
He is Ananth, who doesn't have any anth (end), that is the reason Shiva says " I'm the beginning and end of this Universe". Thus Shri Vishnu and Brahma couldn't discover the beginning and end of the endless section of fire wherein Shiva changed Himself into.
Shiva is Nava_Youvanabhyam this implies that Shiva is everlastingly youthful and wonderful, that is the reason they state God Shiva is Satyam ( truth), Shivam ( favorable) and Sundaram( generally excellent).
Along these lines, Shiva the Swayambhu, who made Himself is unborn and nobody knows the source of the Parabrahman Shiva. So Shiva was there when nothing existed and will be there, in any event, when all that stops to exist.