This is an annual rugby union competition played by teams from Sydney, Australia based boys high schools who are members of the AAGPS
History
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. After a two-year absence High returned in 2011 with their 1st XV in the 2nd XV competition. In 2012 the Armidale School's 1st XV was admitted into the 2nd XV competition while High were placed in the inaugural 3rd XV competition. 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. It was decided that both the 1st XV and 2nd XV competitions would only include Newington, Shore, Riverview, St Josephs, Kings and Scots. The 3rds of all these schools joined the 1sts of Armidale, Grammar and High in a nine-team 3rd XV competition. With the 1st XV and 2nd XV only having six teams it was also decided that the competition format should change from a single round-robin to a double round-robin. The 3rd XV competition remained a single round-robin.