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The ancient world is relevantly different from the modern world.
Leadership works basically the same way in the ancient world and in the modern world.
the study of the ancient world trains you to tell fact from fiction
the study of the ancient world allows you to study leadership in an interdisciplinary fashion: language, art, material culture, values, stories, symbols, and emotions.
Ancient influence networks depended heavily on social practices like slavery, dowries/bride-prices, cursus honorum, typical unprofessionalization of bureaucracy.
the study of ancient world puts you in the mind of ancient leaders, so that you can experience their emotional stresses and decision-making process. It is a kind of experiential learning.
the study of the ancient world introduces you to the world of language, metaphor, and the art of persuasion.
the study of the ancient world teaches emotional intelligence (EI): self-awareness (e.g., of your strengths/weaknesses, emotional states, and impact on others), self-regulation, social skill, empathy/perspective-taking.
"studying the ancient world" is not the same thing for all students.
studying leadership--in any way--is no substitute for practicing leadership. There is no example of a leader who can simply study for the role and then be good at it on the first try (e.g., boss, coach, teacher, statesperson, artist).
what it means to be a "good leader" may vary from context to context, time to time.
There may be better trainings.
all who study the ancient world are not "good leaders" in any obvious or uniform sense.