Jesus Green is one of Cambridge's oldest public open spaces, a long strip of grassland running alongside the River Cam where town and gown have crossed paths for centuries. Named after the neighbouring Jesus College, it has the easy, unhurried feel of a place that knows it isn't the main attraction and is entirely comfortable with that.

Once a year, however, it becomes the centre of something considerably less restrained. Caesarian Sunday, known to students as C Sunday, marks the start of Easter Term and serves as the last collective act of sunshine and excess before exam season descends. Its origins are resolutely collegiate: an annual confrontation between the drinking societies of Jesus College and Girton, the Jesus Caesarians and the Girton Green Monsters. The brawling element was banned in 2014, though the tabloids have continued to take a lively interest.

VoiceMap's "Hidden Histories and Remarkable Rivalries" tour uses Jesus Green to unpack the long tradition of inter-college competition that runs beneath Cambridge's scholarly surface.