"Haack legt ein wichtiges Werk vor, das Anregungen für weitere Untersuchungen bietet und zu Zustimmung und Widerspruch auffordert." Timo Bollen in: MGZ 80/1 (2021): 171-174.
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"Haack provides an insightful, thoughtful, and readable investigation whose outcome is consistent and thoroughly convincing. The study is an important advancement of research, which will have to be considered in the future by anyone working on related subjects." Laury Sarti in: Early Medieval Europe, 2/2022