Thana Minor
A small system with two planets, Thana is mostly known for the smaller of the two. While Thana Major is a gas giant with 15 moons, it's Thana Minor's former function as a Shrine World for the whole sector that made it a common destination for pilgrims. But as the 11th Black Crusade swept thru the Audacia Sector and Thana Minor was caught in its path, the planet was considered condemned and ceased its function.
That doesn't mean that the Ecclesiarchy has given up on the world, however. While the planet has been deemed purged of all forces of Chaos in 347.M39, the taint of Chaos remained, but the Ecclesiarchy has worked tirelessly over the centuries to once again open the Shrine World to the public. As recently as 777.M41 there have been minor demonic incursions, but since then the planet has been deemed clean. Recently clues have been found that point towards the moons of Thana Major as a source for the demons.
The Order of the Pale Lady of the Adepta Sororitas has been stationed on Thana Minor even before the beginning of the cleansing, defending the planet even during the 11th Black Crusade. This order is named for Saint Ashley, the primary saint for whom Thana Minor was made into a Shrine World, and a venerated saint in all the sector.