Instead , Northern Wei 's Emperor Taiwu issued an edict ordering him to surrender , which he did not do .
In summer 428 , Helian Ding sent an embassy to Northern Wei requesting peace .
Northern Wei 's Emperor Taiwu issued an edict ordering Helian Ding to surrender , which Helian Ding did not do .
In summer 428 , Helian Ding sent an embassy to Northern Wei requesting peace .