These letters, the Second Crusade, were written as official bulletins, in order to set before the German people the disastrous events of the crusade in the light most favorable to the German participants. See especially Kugler: Studien zur Geschichte des zweiten Kreuzznges.
- letter from Conrad III to Wibald, Abbot of Corvey in 1148.
- Another letter from Conrad III to Wibald, Abbot of Corvey in 1148.
- letter from Conrad III to Wibald, Abbot of Corvey in 1148.
- Another letter from Conrad III to Wibald, Abbot of Corvey in 1148.