Tales of the Concordat Book 3 – Revolt and Rebirth, by Jefferson Swycaffer, paperback science fiction novel
“The past and the future collide in a crisis of history: the Star-Bridging Empire of Archive is on the verge of collapse, and it’s centuries-later descendant, the Concordat of Archive is equally unstable and threatened. Trillions of lives hang in the balance, and the fate of civilization itself. In each of these two epochs, the actions of lone individuals — young and pretty Lyra, a selfish noble — and Athalos Steldan, a crusading reformer — will make all the difference. Sometimes, just one person can topple an empire….or save it.”
Of interest especially to Traveller fans because not only is this ‘Travelleresque’ SF, the author explicitly says so and thanks Marc Miller in the Acknowledgment.