Who's originally responsible for placing the stones here?
The Circle was created by the first great wizards of Habololy, of whom the only name that is remembered is Gaelwynon, an elf of the Vinsaise. Legend tells that the circle was created to focus magic, allowing spells of great power, that were previously unable to be cast, to be used by the circle’s creators. It took some time, but eventually, other wizards developed spells of epic power and the power that had been created for a few spilled out into the world.