Mahakala, 12th century ceramic ornament

Mahākāla (Sanskrit) is a Dharmapala ("protector of dharma") in Vajrayana Buddhism, and a deity in Chinese and Japanese Buddhism, particularly in the Vajrayana school. He is known as Daheitian (大黑天) in Chinese and Daikokuten (大黒天) in Japanese. Mahākāla belongs to the fourth hierarchy of deities. In Hinduism, Mahakala is a name of Shiva (as, for example, at the Shiva temple in Ujjain that is more than once mentioned by Kālidāsa), but it is also a name of one of his principal attendants (Sanskrit: gaṇa): along with Nandi, which is one of Shiva's watchmen, and so is often represented outside the main doorway of early North Indian temples.