Introduction:
The first staunch supporter of orthodox Brahmanical faith among the mentioned rulers was Pushyamitra Sangha. He was an important ruler of the Mauryan dynasty and played a significant role in promoting and upholding the orthodox Brahmanical faith during his reign.

Background:
During the Mauryan period, Emperor Ashoka embraced Buddhism and propagated its teachings throughout his empire. However, after Ashoka's death, there was a gradual decline in the influence of Buddhism, and orthodox Brahmanical beliefs started to regain prominence. Pushyamitra Sangha emerged as a strong supporter of the Brahmanical faith and worked towards its revival and restoration.

Role of Pushyamitra Sangha:
Pushyamitra Sangha, as the founder of the Shunga dynasty, actively promoted orthodox Brahmanical practices and patronized Brahmin scholars and priests. He sought to establish a religious and cultural revival centered around Brahmanical traditions and rituals.

Restoration of Vedic Practices:
Pushyamitra Sangha played a crucial role in reviving Vedic practices and rituals. He encouraged the performance of sacrifices, Yajnas, and other religious ceremonies associated with the Vedic tradition. The Brahmins, who were traditionally responsible for conducting these rituals, regained their prominence and influence during his reign.

Patronage of Brahmin Scholars:
Pushyamitra Sangha patronized Brahmin scholars and encouraged the study and preservation of Vedic texts. He supported the establishment of educational institutions and centers of learning where Brahmins could study and teach the Vedas, Upanishads, and other sacred texts.

Support for Brahmanical Institutions:
During his rule, Pushyamitra Sangha provided patronage and financial support to Brahmanical institutions such as temples, monasteries, and religious centers. These institutions became centers of religious and cultural activities, further strengthening the influence of the orthodox Brahmanical faith.

Conclusion:
Pushyamitra Sangha was the first staunch supporter of the orthodox Brahmanical faith among the mentioned rulers. His efforts in promoting Vedic practices, patronizing Brahmin scholars, and supporting Brahmanical institutions played a significant role in the revival and restoration of the Brahmanical tradition during his reign.