This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.
A historical period entry records a named span of time defined by a documented political, dynastic or cultural continuity, considered here specifically for the religious life, practice and belief that developed within it, distinct from a single event in covering a sustained era rather than a moment. The Oxford History of Ancient Egypt, edited by Ian Shaw, divides that civilization's long span into documented kingdoms and intermediate periods, a periodization built from dynastic succession and archaeological evidence rather than from any single ruler's reign alone.
An entry records a period's documented start and end, usually marked by a dynastic change, a conquest or another dateable political event, and what religious institutions, practices or texts are specifically documented as belonging to that span, since a period's religious life very often changed considerably between its own beginning and its own end.
Where a period's boundaries are themselves debated by historians, exactly when one period ends and another begins is frequently a matter of scholarly argument rather than a fixed, agreed date, and the entry records that documented disagreement honestly rather than presenting one proposed boundary as settled.