Charles Harold St. John Hamilton was an English writer, specialising in writing long-running series of stories for weekly magazines about recurrent casts of characters, his most frequent and famous genre being boys' public school stories, though he also wrote in other genres. He used a variety of pen-names, generally using a different name for each set of characters he wrote about, the most famous being Frank Richards for the Greyfriars School stories featuring Billy Bunter. Other important pen-names included Martin Clifford, Owen Conquest and Ralph Redway. He also wrote hundreds of stories under his real name such as the Ken King stories for The Modern Boy.

Greyfriars School is a fictional English public school used as a setting in the long-running series of stories by the writer Charles Hamilton, who wrote under the pen-name of Frank Richards. Although the stories are focused on the Remove, whose most famous pupil was Billy Bunter, other characters also featured on a regular basis.