Strickland's the Great Sism

Strickland blames Charlemagne, helped by the papacy for increasing tension between East and West. This resulted in a series of incomplete and partially healed sisms, culminating in the great sism. Strickland explains that Christendom regarded the first millennium in apocalyptic terms. But as Strickland points out, the imminence of Christ was a standard belief in Christendom. And there Strickland leaves us, to pick up in his next volume.