The answer is shamans. Milady's History chapter states it directly: "Belief systems elevated tribal barbers to positions of importance, such as medicine men, shamans, or priests." Hair and beard cutting in many early cultures wasn't a purely practical service — it carried real spiritual or ceremonial weight, which is why the people who performed it held elevated social standing.
Tonsorial artists, warriors, and rulers — the other choices — aren't the roles Milady names in this specific passage; "tonsorial" is genuine barbering terminology (it means relating to hair-cutting), but it describes a later professional title, not the tribal/spiritual role this question is asking about.
Milady Standard Barbering, 6th ed., Ch. 1 (The History of Barbering), p. 7: "Belief systems elevated tribal barbers to positions of importance, such as medicine men, shamans, or priests."
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More real History questions with sourced answers: What Latin Word for "Beard" Is the Origin of "Barber", What Does the Acronym NABBA Stand For, What Barbering Trend Returned for Young Men in 2010.
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