 Beorhtwulf and his wife , Sæthryth , may have had two sons , Beorhtfrith and Beorhtric . Beorhtric is known from witnessing his father 's charters , but he ceased to do so before the end of Beorhtwulf 's reign . Beorhtfrith appears in later sources which describe his murder of Wigstan , the grandson of Wiglaf , in a dispute over Beorhtfrith 's plan to marry Wigstan 's widowed mother Ælfflæd . Beorhtwulf 's death is not recorded in any surviving sources , but it is thought that he died in 852 . 
