We are all aware that the Holy Roman Empire saw its imperial,

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We are all aware that the Holy Roman Empire saw its imperial, roman and holy qualities change over time, and that a certain jerk questioned them at a certain point.
Yet earlier in history, and maybe later, they had their own peaks and valleys.

At what point was the Holy Roman Empire the most holy, or the most roman, or the most imperial? At what point was it the most of all those things, and thus most deserving of the name?

When did we hit peak HRE?