Ancient Egyptian represents the typologically marked case of a language in which the dynamic-stative contrast among verbs correlates with two finite verb paradigms. Building on earlier work (Reintges 2005, 2006), the present study examines the morphosyntax of the Stative inflectional paradigm by combining synchronie, diachronic and typological viewpoints. The Stative is a showcase for the diachronic stability of an inflectional category, remaining an integral part of the Egyptian verbal system throughout its entire history. In spite of this diachronic stability, it undergoes inflectional changes. The morphological simplification and paradigm erosion that we see with the Stative in later stages represents a hitherto unnoticed case of endogenous morphological change, which proceeds largely independently of concomitant syntactic and semantic changes.