Varuna is the king of the waters. Indra is said to be the king of the Maruts. Arka is the king of all hot bodies, and Indra of all luminous bodies.
अम्भसां वरुणो राजा मरुतामिन्द्र उच्यते॥ अर्कोऽधिपतिरुष्णानां ज्योतिषामिन्दुरुच्यते।