Regicides Trail is a Blue-Blazed hiking trail, about 7 miles (11 km) long, roughly following the edge of a diabase, or traprock, cliff northwest of New Haven, Connecticut. It is named for two regicides, Edward Whalley and his son-in-law William Goffe, who signed the death warrant of King Charles I of England. Upon the restoration of Charles II to the throne and the persecution of the regicides, the pair hid in Judges Cave near the south end of the trail in 1660. The Regicides is widely known to be one of the most technical trails within the CT Blue-Blazed trail system.