Here's an idea: A fictional story of Ancient Rome.
Once upon a time, there was a Roman Emperor named Gaius. He lives with his two children, 1 son and a daughter, and his wonderful wife. The Emperor was a good man but also a skilled warrior and good strategist. Many politicians and several Roman Generals are jealous of the Emperor's success. One day, the group of senators have plotted to kill the Emperor. They have succeeded in assassinating the Emperor, thus, it lead to the escape of his family members. The Emperor's brother, Lucius Brutus, became an Emperor after the assassination of his brother.
The Emperor's son, Maximus Claudius (MC), will embark his journey to regain his father's throne.
The game will either be in RPG or strategy game where you will conquer territories, gain allies and meet beautiful women along his way. MC will develop a romantic relationship with his mother and sister. MC will soon become an Emperor after he defeats his evil Uncle. Uncle will be the final boss of the game.
Maps to explore:
Rome
Egypt
Germania
Britannia
Judea/Palestina