The document describes the long-running rivalry between graffiti artists Banksy and King Robbo (real name John Robertson) that began in the 1990s in London. Their feud started when Banksy painted over one of Robbo's pieces, and escalated as they continued targeting and defacing each other's work. Though their styles differed - Robbo worked freehand while Banksy used stencils - the rivalry drove them both to increased artistic output. While antagonistic, their collaboration also blended their styles and influenced street art. The feud ended tragically with Robbo's death in 2014.