Ancient Greeks used the word eros (Greek: ἔρως) to refer to different aspects of love. This diverse range of meanings is expressed by the plurality of Greek words for Love, reflecting the versatility and complexity of eros. The term was used to describe not only the affectionate marital relationship between a man and a woman but also the institution of pedagogic "pederastic" relations (Eros paidikos, παιδικός ἔρως), solemnized in certain Greek poleis. Such was the importance of eros for the ancient Greeks that the god of love, also named Eros, was held in Hesiod's cosmogony to be the primordial deity, the first god, older than all the others.