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"You are incorrect in your recollection. By all accounts, Osiris is a Dynasty 5 creation"

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"Osiris - first attestation of the image of Osiris is from the Fifth Dynasty, where it appear on a block of the pyramid temple of Djedkara Izezi, dated to about 2405 BCE. This figure was not in mummiform shape, which has led to debate about the identification of this figure with Osiris, since his attribute is primarily funereal (for contra opinion on this figure ID as Osiris, see Griffiths 1980, Lorton 1985, and Eaton-Krauss 1987) (Griffiths 2002: 303-304)." -- Katherine Griffis Greenburg

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"Zivie-Coche (1991) porposed that a fully-operating cult of Isis appears to have had its origins in the New Kingdom, though references to Isis appear before then, mainly as references to Isis as wife-sister of Osiris, which is datable to Dynasty 4. Until the New Kingdom, argues Zivie-Coche, Isis was merely part of the Osirian triad mythos.

Zivie-Coche, C. 1991. Giza au premier millénaire. Autour du temple d'Isis Dame des Pyramides. Boston: Museum of Fine Arts. " -- Katherine Griffis Greenburg