Timeline: Orbis Romanum
The assassination of Julius Caesar on March 15 44BC was followed by a destructive civil war. What if Marcus Antonius had arrived in time and saved Caesar? The resources wasted on internal battles could have been used to expand eastward. The Greeks would have had a stable environment in which to advance human knowledge and science. Contact with Indian and Chinese civilizations could have contributed to scientific development. The industrial revolution could have happened 15 centuries earlier. The 5th century could have seen the first Greek moon landing.