Various regions.....
1. The king were annoyed by the interference of brahmans in their ruling.
2. Majority of people annoyed by brahmnic rituals and sacrifices bcs of this majority of people adopted buddhism or jainism and these religion were popular amongst masses. So king gain trust and faith of masses after adopting this religion.
3. The impact of buddhist and jain scholar on king. Example menander-1 adopted buddhism after duscussing and questiong with buddhist monk nagsena. Similarly ashoka was also influenced by buddhist ideology after kalinga war. Chandragupta maurya also impacted by jainism philoshphy.
4. Buddhism and jainism also opens door for everyone to become king. They got a chance with these religion to agitate against varna system and become king.

Ancient India: Buddhism and Jainism as Popular Religions among Kings

Introduction
In ancient India, Buddhism and Jainism emerged as influential religious and philosophical traditions. These religions gained significant prominence among the kings and ruling classes during this era. The reasons behind this phenomenon can be attributed to various factors, including social, political, and cultural aspects of ancient Indian society.

Social Factors
1. Non-violence and Ahimsa: Both Buddhism and Jainism promoted non-violence and ahimsa (non-injury) as core principles. Kings, as the rulers, were expected to uphold peace and non-violence within their kingdoms. By following Buddhism or Jainism, kings showcased their commitment to these ideals.
2. Equality and Social Justice: Buddhism and Jainism emphasized the equality of all individuals and advocated for a just and compassionate society. Kings, who were responsible for maintaining social harmony, were attracted to these religions as they aligned with their vision of a fair and egalitarian society.

Political Factors
1. Appealing to Subjects: Buddhism and Jainism gained popularity among the masses, including farmers, traders, and artisans. By embracing these religions, kings could establish a stronger connection with their subjects, ensuring their loyalty and support.
2. Peaceful Coexistence: Both Buddhism and Jainism promoted peaceful coexistence and harmony among different communities. Kings, seeking to avoid conflicts and maintain stability within their domains, were drawn towards these religions for their emphasis on tolerance and non-discrimination.

Cultural Factors
1. Patronage and Support: Kings played a crucial role in the patronage and propagation of various religious and philosophical traditions. Buddhism and Jainism received significant royal support, leading to their flourishing during this period.
2. Intellectual Appeal: The philosophical teachings of Buddhism and Jainism, such as the Four Noble Truths and the concept of karma, resonated with the intellectual elites of ancient India. Kings, often regarded as patrons of learning, were attracted to these religions for their intellectual depth and philosophical insights.

Conclusion
The prevalence of Buddhism and Jainism among the kings of ancient India can be attributed to a combination of social, political, and cultural factors. The emphasis on non-violence, social justice, peaceful coexistence, and intellectual appeal made these religions highly attractive to the ruling classes. Furthermore, the support and patronage of kings played a crucial role in the growth and spread of Buddhism and Jainism throughout the Indian subcontinent.