They are two of the “Four Heavenly Emperors”. “Tian-Huang Da-Di” is the one directing the North and South Poles, the sky, the earth, the people. He is also in charge of the stars and the wars.
“Tu-Huang Di Zhi” is the Heavenly Emperor (Female) responsible for the bearing, breeding and growing of all living things. She is also responsible for land and mountains on earth.
Written and Translated by Daoist Liu Cheng Yong, German Daoist Association.