This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.
Nicholas Campion's history of Western astrology traces how Ptolemy's own psychological scheme, the planetary rulership of specific mental and moral qualities his Tetrabiblos lays out, was received, copied, argued over and reworked across the many centuries between the Hellenistic world that produced it and the present day, rather than treating that scheme as if it arrived unchanged.
That documented history matters for a characteristic entry because later astrologers did not always keep Ptolemy's own specific pairings intact, and Campion's study records where a later writer's own reworking diverges from the Tetrabiblos, letting an entry state honestly which parts of a characteristic's documented meaning trace directly to Ptolemy's own text and which parts entered through a documented later addition.
Campion's account also situates this scheme within the wider documented history of astrology as a practiced intellectual tradition, its periods of institutional favor and disfavor, its transmission through Arabic and Latin translation, and the modern revival that eventually recovered texts like the Tetrabiblos itself for direct study rather than leaving them known only through later summary.
An entry therefore draws on Campion's history for the documented chain of transmission and reworking, while keeping Ptolemy's own Tetrabiblos as the primary source for the scheme's original content.