In Bhagavad-gītā the Lord says that whenever one sees an extraordinary power, he should conclude that a specific partial representation of the Supreme Personality of Godhead is present. There are innumerable such personalities, but not all of them are direct viṣṇu-tattva plenary expansions of the Lord. Many living entities are classified among the śakti-tattvas. Such incarnations, empowered for specific purposes, are known as śaktyāveśa-avatāras. King Pṛthu was such a śaktyāveśa-avatāra of the Lord. Similarly, Arci, King Pṛthu’s wife, was a śaktyāveśa-avatāra of the goddess of fortune.