I would introduce the horse collar. It existed in Europe as early as the 10th century but was not widespread until around 1200. It enabled horses to pull plow

I would introduce the horse collar. It existed in Europe as early as the 10th century but was not widespread until around 1200. It enabled horses to pull plows and was much more efficient. In order to use my much increased grain production, I would introduce distillation and whiskey. Ah the riches.