Royal Grammar School, Newcastle upon Tyne, usually abbreviated as RGS, is a selective British independent school for pupils aged between 7 and 18 years. Founded in 1525 by Thomas Horsley, the Mayor of Newcastle upon Tyne, it received royal foundation by Queen Elizabeth I and is the city's oldest institution of learning. The School is located in Newcastle upon Tyne, in North East England, and is a member of the Headmasters' and Headmistresses' Conference. In 2008, RGS became fully co-educational after 450 years as an all boys' school. It has a current enrollment of more than 1,200 pupils.