 An alternative model of Mercian succession is that a number of kin @-@ groups may have competed for the succession . The sub @-@ kingdoms of the Hwicce , the Tomsæte , and the unidentified Gaini are examples of such power @-@ bases . Marriage alliances could also have played a part . Competing magnates — those called in charters " dux " or " princeps " ( that is , leaders ) — may have brought the kings to power . In this model , the Mercian kings are little more than leading noblemen . 
