This reduction in the power of Canterbury may have been motivated by Offa's desire to have an archbishop consecrate his son Ecgfrith as king, since it is possible Jænberht refused to perform the ceremony, which took place in 787.
Reduktionen af Canterburys magt kan have været motiveret af Offas ønske om at få en ærkebiskop til at velsigne hans søn Ecgfrith som konge, da Jænberht muligvis nægtede at udføre cerimonien, der fandt sted i 787.