 Complete the following phrase:  The parliament of 1327 was a watershed event. For the first time since the Norman Conquest, an English king was disposed peaceably, and not usurped by military means. Although Edward II had been previously threatened with deposition in 1310 and 1321, all those who attended the parliament of 1327 were aware of the constitutional crisis. The king was imprisoned by his Queen Isabella and her paramour Roger Mortimer after their 