The eight lingams around Arunachala Hill are believed to have been established over centuries, with their origins deeply rooted in Hindu mythology and local traditions. The Indra Lingam, representing the East, is associated with Lord Indra, the king of the gods. While the exact date of its establishment is difficult to pinpoint, it's likely that the lingam and its associated temple have been venerated for many centuries, possibly dating back to the Chola or Pallava periods. The construction and maintenance of the temple may have been supported by local rulers and communities throughout history. The significance of the Indra Lingam lies in its role within the larger context of Arunachala's spiritual landscape, representing one aspect of the divine presence surrounding the holy hill.