To subdue the three worlds, as conqueror of them, e.g. 降三世明王 Trailokya-vijaya-rāja, rāja subduing the three realms above, here, below, one of the five great 明王 q.v.; the one controlling the east; subduer of the three realms of desire, resentment, and stupidity; also of these three passions in past, present, future. There are other similar rājas.

A Dictionary of Chinese Buddhist Terms, William Edward Soothill and Lewis Hodous