The Heruka of the Kalachakra Tantra is commonly also called "Kalachakra".
He is a Highest Yoga Tantra meditational figure of the "Non-Dual" class.
His consort is known as Vishvamata. He is known as "The Lord of Time".
This is the Kalachakra Mandala
This is the Mandala of the Kalachakra Tantra. It is a floor plan of
the Celestial Palace of the Kalachakra Diety. Just as he is the "Lord of Time" so this
Mandala is known as "The Wheel of Time".
