Eric Christiansen: The Northern Crusades [1997] paperback

The 'Northern Crusades', inspired by the Pope's call for a Holy War, are less celebrated than those in the Middle East, but they were also more successful: vast new territories became and remain Christian, such as Finland, Estonia and Prussia. Newly revised in the light of the recent developments in Baltic and Northern medieval research, this authoritative overview provides a balanced and compelling account of a tumultuous era.