Yathrib
The planet Yathrib is most notable as the world where the Prophet received his revelation of the Holy Flame, and where he subsequently gave his first sermon to Saint Paulus, his first disciple. Yathrib is a dusty desert planet, with most of its resources buried deep inside its crust; while terraforming could have turned it into a garden world, its importance to the Universal Church of the Celestial Sun meant that even during height of the godless Second Republic it remained untouched.
Geography
Main Article: Geography of Yathrib
Yathrib is a small, dense planet around the size of Mars but with a gravity closer to that of Holy Terra. Its continents are concentrated mostly around the equator, with religious life centered on the City of Revelation, a sprawling - now ruined - metropolis on the shores of the Shining Gulf in the continent of Asher. Two polar continents exist; the smaller, known as the Boreale, is in the north, while the Antipodes in the south comprise a series of landmasses arranged around the Meridian Sea.
Revelation and the Shining Gulf is the scene of most conflict between the Kurgans and Known Worlders; the Known Worlders have their capital at Akko, on the Mount of Apples, just across the gulf from Revelation. The protected counties of the Vale of Apples have never known Kurgan rule.
History
Main Article: History of Yathrib