This is said to be the first case of setto which an emperor granted someone (among the cases of setto which were given to Kento-shi [Japanese envoy to Tang Dynasty China] or seii shogun [great general who subdues the barbarians] as a symbol of authority over the military power).
これが天皇が節刀（遣唐使や征夷将軍などに軍事大権の象徴として授けられた）を授けた初例という。