Reginald Fitzurse and three other knights fled to Knaresborough Castle, founded by Norman Baron in c. 1100 on a cliff above the River Nidd, where they lived for a year after killing Becket on December 29, 1170.
The four knights initially escaped to Scotland and thence to Morville's Knaresborough Castle where they stayed for a year. On 29 December 1170 they burst into the cathedral choir at Canterbury clad in armour and carrying swords determined to capture or kill Becket. The castle was first built by a Norman baron in c. 1100 on a cliff above the River Nidd. 
