Prime universe Spock's counterpart and mentor figure to the alternate Spock.
The two Spocks are counterparts separated by time and a changed timeline.
The older Spock explains that his arrival from the future created a parallel universe, making the younger Spock an alternate-timeline counterpart.
Ambassador Spock belongs to the future history that the altered timeline disrupts.
The plot distinguishes the older Spock from the alternate-timeline crew and presents him as a surviving figure from the original future.
Their only established connection is that Robau is questioned about Ambassador Spock's identity.
The Romulan commander questions Captain Robau about the current stardate and an Ambassador Spock whom Robau does not recognize.
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Related entry on Wikidata (Q16341), public domain (CC0).