Let you farm, you become the emperor of the empire?

Summary

A world of the Middle Ages: conquering knights, dragons, demons, gods, pirates, and behemoths… A barbaric, ignorant, backward, and apathetic era. Starving corpses litter the lands, and the people suffer in misery… Damn it! I’m going to shatter this era with a single punch!! Clearing wasteland, farming, building bridges, paving roads, mining coal, and extracting ore! Grinding EXP, recruiting Apostles, and forging an army! Mass-producing troops! Sweeping across the continent! Hell yeah! My tide of steel is invincible!! Roman: “I am your destiny! All of you, kneel before me!” So you were told to farm, but how did you end up building a vast empire and becoming the Emperor?