According to the official canon pre-T5 the answer was no. In the discussions in the T5 background, the kursae are mentioned. They are mentioned in the T5 rule book with no further details.

The Vilani and Zhodani are the first to develop Jump drives, but a few others ( the Seurrat for example) have colonies planted by generation ships. Some of them are older but just barely.

On Thu, May 28, 2020 at 7:27 AM Jeff Zeitlin <xxxxxx@freelancetraveller.com> wrote:
Is there any indication in canon that there were
post-Ancient/post-Final-War starfaring civilizations, especially human
ones, prior to the Vilani and Zhodani appearing on the scene?

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