The circle of six was founded by Lady Shiva . They made their first appearance in the Richard Dragon series published by Dc comics in 2004. Each member was a very skilled martial artist in his/her own right but together they could rival even Richard dragon. They tried to take over the crime scene in a few cities until a combination of  Richard Dragon, Bronze Tiger  and Nightwing/ Dick Grayson  defeated them.
 
After this battle Joey was left with a broken leg and it is assumed they soon disbanded. 
 
 Later some members became part of Nyssa 's  League of Assassins's under the leadership of  Lady Shiva . Here they clashed with Cassandra Cain  who was then Batgirl .
 

Fate

 
  Hwa Rang , Tengu  and Joey N'bobo were killed by Shiva. Wam Wam was killed by Mad Dog.  Kitty Kumbata  and Iron Aron Abromowitz are the only members left alive.