Benjamin Lett was an Anglo-Irish-Canadian filibusterer who was a disciple of William Lyon Mackenzie. Although he didn't participate in the Upper Canada Rebellion, in 1838 he was charged with the murder of Captain Edgeworth Ussher. Wikipedia*
On the C-SPAN Networks:
Benjamin Lett has one video in the C-SPAN Video Library; the first appearance was a 1998 Call-In.