When Kaal Bhairav was billed of Brahma Hatya, he came to Kashi to hunt penance and it was only in the holy land of Kashi that he was eventually free of charge from your sin of your killing. From that point on, Kaal Bhairav is claimed to reside in Kashi, https://titusjrtux.tokka-blog.com/30119161/detailed-notes-on-bhairav