I always felt that things were never really the same after the demise of Otto der Große - though I suppose that an argument could be made that the Reich continued up until the execution of Konradin (the son of Konrad IV) in Naples in the year 1268, though we did at least gain an independent Italy, with Savoy, Milan, Venice, Genoa, Florence, the Papal State, Naples, and Sicily finally coming into their own.
Are you a student of history?

Regards,
Germany actually never existed until over 200 years after that.