For their involvement in the Southampton Plot https://en.wikipedia.org/wiki/Southampton_Plot in 1415 Richard of Conisburgh, 3rd Earl of Cambridge (b. 1375) https://en.wikipedia.org/wiki/Richard_of_Conisburgh,_3rd_Earl_of_Cambridge and Henry Scrope, 3rd Baron Scrope of Masham (b. 1370) https://en.wikipedia.org/wiki/Henry_Scrope,_3rd_Baron_Scrope_of_Masham are beheaded on this day in history.