Saving Rome Starts with Marrying a Saint

A soul from afar arrived in Constantinople in 1420. He had no choice but to do his best to save the declining empire he found himself in. But if there were any shortcuts to take... Constantine naturally turned his attention to the famous generals of his time. ----------------------------------------------------------- The story of the protagonist transmigrating into Constantine XI, going to Italy to form a mercenary company and take part in its wars, heading north to fight in the Hundred Years' War, rescuing Joan of Arc, marrying a saint, and reaching the pinnacle of life (crossed out). A story about saving the Roman Empire.