Was Buddhism a rebellion against the Aryans?

I read and learned many areas in Buddhism, for example the Seven Arya Dhana (Saptharyadhana - The Sevenfold Noble Wealth), the Four Noble Truths (Chathurarya Sathya) and the Eightfold Path (arya ashtangika marga). I sometimes feel in the time when Gautama was born, the Aryans had ultimate power because of the caste system. So Gautama needed to break that authority and misbehave and tell people that this is the way to be an Aryan (and not by family birth in the caste system). I admit that the teaching of [how to live] life is the basis of Buddhism. But rather than that i feel that there are some other things. (Sorry about the Sinhalese wordings. I don't know how to say it in English. Please correct if you know the exact English words). This is not a theory or something. This is something i feel when I am learning the philosophy. Thank you.