Which ruler of the Satavahana dynasty claimed to be a unique Brahmana (eka bamhana)?

The correct answer/option is Gotami-puta Siri-Satakani.

Detailed Explanation:

The Satavahana dynasty was an ancient Indian royal family based in the Deccan region. Among its rulers, Gautami-putra Satakarni (also written as Gotami-puta Siri-Satakani) is widely regarded as one of the most powerful and illustrious emperors of the dynasty.

The historical evidence for his titles and achievements comes primarily from the Nasik cave inscription, which was commissioned by his mother, Gautami Balashri, after his death. This inscription describes his virtues, military victories, and religious devotion in detail.

In the Nasik inscription, Gotami-puta Siri-Satakani is explicitly designated by the Prakrit term "Eka Bamhana" (or "Eka Brahmana" in Sanskrit). This title translates to "a unique Brahmana" or "a peerless Brahmana."

The inscription uses this title to highlight his role as a protector of the Vedic tradition and the Brahmana caste, as well as his efforts to stop the intermixture of castes (social order restoration). Therefore, the ruler who claimed to be a unique Brahmana (eka bamhana) is Gotami-puta Siri-Satakani.