[2] The principal sources covering William's career are Ademar of Chabannes and the anonymous Historia pontificum et comitum Engolismensium.
William was perhaps countering the growing strength of the Counts of La Marche in northern Aquitaine since their family succeeded to the County of Périgord, previously dominated by Angoulême, in 975.
[11] He travelled through Hungary and Slavonia, even though these regions were generally avoided at that time by pilgrims, since they had only recently been converted to Christianity, according to Ademar.
An assembly of the principes et nobiles of Angoulême, Périgord and Saintonge met to judge the woman accused of poisoning him.
[14] William was succeeded at Angoulême by his eldest son, Alduin II, whose younger brother Geoffrey quarreled with him over the inheritance in Bordelais.