The conspirators were hanged for 'high treason'.
He is guilty of 'treason'.
(..) - WOMAN: Pull! (EXHALES) Pull! Count Odo has been executed, by my order, for disloyalty and high treason. He deceived me, even though I trusted and rewarded him. And for such deception and treachery, there can only ever be one punishment. Your Grace will now be entrusted (..)2016 TvShow: Vikings Title: Portage Season: 4 Episode 8