Frocin Timeline and Summary

Frocin tells Mark about Tristan and Yseut's secret trysts, encouraging him to hide out in a tree above their meeting place.
Frocin flees to Wales when Mark, convinced of the lovers' innocence, becomes angry with him.
Mark's barons ask Frocin to return to help them catch Tristan and Yseut together; Frocin spreads flour on the floor between the lovers' beds hoping to reveal Tristan's footprints there.
Frocin deliberately betrays the secret that Mark has horse's ears by telling it to a hawthorn tree while the barons are in earshot.
Mark says that Frocin gave him horse's ears, and cuts off his head.