The Crown at Sea (A Kingdom Building Isekai)

A king is dead. The rightful heir has been named. The usurper is already riding for the crown. Wilmar of Aldenhal knows how this war ends. Not because he's a genius. Not because he's a prophet. Because he remembers another life where he studied the collapse of kingdoms just like this one. His plan was simple: stay invisible, survive, and never let anyone discover what he knows. It fails the moment one powerful lord realizes Wilmar isn't predicting the future. He's remembering it. But history was never written for the people trapped inside its first bloody night. And this time... The future refuses to follow the script.