This is an annual rugby union competition played by teams from Sydney, Australia based boys high schools who are members of the AAGPS.
The official rugby union competition commenced in 1892.
In 2009 after 103 years playing in the 1st XV competition Sydney Boys High School decided to withdraw itself from AAGPS Rugby.
Sydney Grammar School decided not to participate in the 2013 1st XV competition reducing the number of schools competing in the 1st XV to 6.
The 3rd XV competition remained a single round-robin.