Long before there was a Fellowship of the Ring, there was the Brotherhood of Man... and woman.
Ahura Mazdâ gave Spitma the holy name of Zarathutra after his enlightment and gave him the sweetness of tongue to persuade mankind by poetry and not by sword.
Prophet Zoroaster (Zarathutra), meaning Golden Light, from Zaratha (golden) and Ushtra (light), rose against all the cults, the practice of animal sacrifice and meaningless rituals, called himself Zaota, priest, and declared that he had come to convert all, without regards to race, color or gender, into a new faith. He preached the worship of one God, the First and the Last, the Creator-Sustainer, without shape or form or material substance, and the universal law of the divine to all who came from near and far to listen to the Gathas, the Holy Hymns, prayers mixed with moral and spiritual laws for the behavior of mankind, the meaning of right and wrong.
The only division among mankind was righteousness and wickedness. Ashvans were the righteous and Dregvants were the wicked.
Ahura Mazdâ was the friend of Mankind. Mankind was the creation of God, not his child or his slave; he could directly talk and pray to God, if he so wished.
Both good and evil were in the mind of mankind and he was given the ability to know the difference. Man could choose freely the path of good or the path of evil. However, man was warned of the consequences of evil actions, as evident in Gathas: Yasna 48:1:
"Before the struggle in my mind begins, Tell me, Ahura Mazdâ, all that I should know. Give me the knowledge and assurance, Lord, That Righteousness shall overcome Wickedness. That such is thy plan, The final shape of life."
The concept of just one God, who was Wise and Just; that all men and women were equal; that there was life after death; that mankind's salvation and redemption rested entirely in his own hands; were radically new concepts at the time.