They are the matching twin horse spirits who pull SAULE’s copper-wheeled sun chariot across the sky. They are white with golden manes, and have infinite stamina with no need for rest. SAULE looks after them very well with a nice wash-down after work and plenty of golden hay.
Zooming across the sky by chariot is a very popular form of godly transport, and could almost be approaching gridlock — or should it be cloudlock — proportions. The system flows perfectly though, due to two single-way rush hour peak periods. Dawn and Sunset. No speed traps, stop signs, or roundabouts — and no pollution.
As with other aspects of Baltic mythology, there is a strong hint of Indian influence. Note similarity of ASVIENIAI to the Hindu ASHVINS.