Rm.t.n.Km.t Calendar Systems, King Lists et al. that aid us in Dating the Ancient Nile Valley Events and Others' thereof

Many cultural complexes of antiquity encompass time lines showcasing early beginnings in the shape of pre-"centralized" social units, usually as clusters of cities or urban areas (centers) concentrated in one particular sub-region, which may not even be loosely connected via a central governing authority [pending convincing evidence to such end], to reasonably verifiable centralized-state