The German Princess's Path to Caesar

(No gender transformation, male protagonist marries into his wife's family, primarily historical military fiction.)

The tide of the Napoleonic Wars has receded, and the steam engines' earth-shaking roar heralds the dawn of a new age. Beneath the smoke-shrouded skies of Europe, new hope is taking root. In the German lands, chaotic for millennia, three cheers in the Hall of Mirrors at Versailles unite the country under a single crown. From Maas to Memel, from Esch to Belt, Germany is united.

But this ancient yet young nation is born at Europe's most perilous hour. The great bear to the east has emerged from the shadow of Crimea, glaring westward and preparing to assert its role as Europe's gendarme. France seethes with anger, never forgetting the disgrace of Alsace-Lorraine. Sophia Hohenzollern, the German princess who has inherited the memories of a 21st-century university student from the future and is blessed with divine power, can she take up Germany's crown and ensure the nation's unquestioned survival for all time?

Beloved by God, Her Highness the Princess is only just beginning her journey.