One of the thirteen brahmiṣṭha (brahmishta) sages of the Kauśika (Kaushik) clan. Purānas (Puranas) mention sage Aghamarṣaṇa’s (Aghamarshana) kindred as one of the family lines linked to Sage Viśvamitra’s (Bishwamitra) lineage. The lineages of the sages Viśvamitrā, Madhuchandā (Madhuchhanda) and Aghamarṣaṇa were closely related by blood; therefore, marital alliances among the three families were not allowed.

Aghamarṣaṇa is the sage presiding over one of the verses in the tenth maṇḍala (mandal) of Ṛgveda (Rigveda). This incantation is for eradication of all sins (agha). This verse is also known as the Aghamarśan verse after the sage. The verse has been glorified many times in Mahabhārata (Mahabharata) as well.

Aghamarṣaṇa was among those sages who were pioneers of Vānaprastha and attained salvation by following it. Bhīṣma mentions these sages in Śāntiparva (Shantiparba) of Mahabhārata.