Source books · Greek and Roman mysteries

Roman History

Rhōmaikē Historia

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Traditions
Greek and Roman mysteries
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Secondary source A study of the tradition from outside it: history, scholarship, anthropology or reference.
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In this study

Cassius Dio's history includes an early explanation of the seven-day planetary week and the planetary-hour order used to derive it.

Book 37.18–19 explicitly gives both the sequence of weekday rulers and the hourly Chaldean order.

Cited for 7 sourced claims here, among them correspondences of Friday, Jupiter, Mars, Mercury, Monday, Moon, Saturday and Saturn.