Why was buddhisim successful in challenging brahmin power

Brahmin power is a fiction - India was always ruled by kings not priests. Buddha himself was a scion of a royal family as were many other sages and enlightened beings.

Buddhism was never a political movement - it was about achieving freedom from suffering not about power and prestige.

Buddha like many of his contemporaries among the Hindus and the Jain challenged many of the philosophical positions of each other but socially lived in cooperation and harmony.

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pepin the short[a] (german: pippin der kurze, french: pépin le bref, c. 714 – 24 september 768) was the king of the franks from 751 until his death. he was the first of the carolingians to become king.[b][2]

the younger son of the frankish prince charles martel and his wife rotrude, pepin's upbringing was distinguished by the ecclesiastical education he had received from the monks of st. denis. succeeding his father as the mayor of the palace in 741, pepin reigned over francia jointly with his elder brother carloman. pepin ruled in neustria, burgundy, and provence, while his brother carloman established himself in austrasia, alemannia and thuringia. the brothers were active in suppressing revolts led by the bavarians, aquitanians, saxons, and the alemanni in the early years of their reign. in 743, they ended the frankish interregnum by choosing childeric iii, who was to be the last merovingian monarch, as figurehead king of the franks.