Terra

"'Terra is the Throneworld of the Imperium, the beating heart of Human civilization. It is the seat of the Emperor of Mankind.'"Terra, also known previously as Earth is the Throneworld of the '''Imperium of Mankind. '''It is the seat of power for the Emperor of Mankind, and where the High Lords of Terra gather and convene their meetings to decide laws that affect the Imperium at large.

Trival
Image: https://vignette.wikia.nocookie.net/warhammer40k/images/6/6d/Holy_Terra.jpg/revision/latest?cb=20100805081328