Cheng Yan travels through time, only to end up becoming an honorable prince in the Middle Ages of Europe. Yet this world was not quite as simple as he thought. Witches with magical powers abound, and fearsome wars between churches and kingdoms rage throughout the land. Roland, a prince regarded as hopeless by his own father and assigned to the worst fief, spends his time developing a poor and backward town into a strong and modern city, while fighting against his siblings for the throne and absolute control over the kingdom. Join Roland as he befriends and allies with witches and, through fighting and even farming, pushes back invaders from the realm of evil.
It's one of the first and best novels I have read along with My House of Horrors and Novel's Extra. Release That Witch introduced me to the kingdom building fantasy genre. Now, I am searching for similar novels where mc is from our era, gets transmigrated, or isekai'd into the past or fantasy world and uses modern knowledge to build civilization.