How was the idea of homoousion developed, and when was this term used prior to the Nicean Council?

According to the Nicean Creed, Jesus Christ is said to be: >Light of Light, true God of true God, begotten and not made; of the very same being (**ὁμοούσιον**) of the Father, by Whom all things came into being, in heaven and on earth, visible and invisible. > >φῶς ἐκ φωτός, Θεὸν ἀληθινὸν ἐκ Θεοῦ ἀληθινοῦ, γεννηθέντα οὐ ποιηθέντα, **ὁμοούσιον τῷ Πατρί**, δι' οὗ τὰ πάντα ἐγένετο How was the idea of homoousion developed, and when was this term used prior to the Council of Nicea?