By 982 the entire area once ruled by Pandulf had collapsed, weakening Otto II's position against the Byzantines. The Byzantines still claimed sovereignty over the Lombard principalities, and the lack of a single leader to prevent their advances into Lombard territory allowed the Byzantines to make inroads further north. Otto II attempted on several occasions to reunify the Lombard principalities politically and ecclesiastically into his Empire after Pandulf's death. Though he unsuccessfully besieged Manso I in Salerno, Otto II ultimately obtained the recognition of his authority from all the Lombard principalities.