I don't know what that is.
Trilogy of books (Sos the Rope, Var the Stick, Neq the Sword) that were collected into one book (Battle Circle). Piers Anthony, back in the late 60s through mid 70s.
Post-apocalypse Earth, nomads nomad nomadically and specialize in one weapon (sword, staff, club, daggers, morning star, or paired sticks) and whoop each other's ass for any old thing (wine, women, song, the price of rice). They fight in a Battle Circle. Shit is stabilized by what is more or less a Vault that produces goods and distributes them to a second group, who distributes said stuff to the nomads.
Various nomads band together to wipe out the Vault, which Causes Problems, then the next generation returns and more ass is whooped and Problems are fixed.
Roughly close enough to your description of The Circle that I can probably pick and choose elements I recall from a book I read the better part of thirty years ago to toss in there with my No Way This Totally Isn't He-Man version of the setting.