Name one event that happened in Ancient rome and one in ancient greece around the same time and list a timeline

These events may include the following:
• the development or spread of the civilization or ideas and practices from the civilization
• religious ideas or cultural practices
• scientific or technological inventions or advancements
• agricultural or economic developments
1-2 sentences for each event

Ancient Rome: In 44 BC, Julius Caesar was assassinated by a group of senators, marking the end of the Roman Republic and the beginning of the Roman Empire.

Ancient Greece: Around the same time, in the late 5th century BC, the Peloponnesian War was fought between the city-states of Athens and Sparta, leading to significant cultural and political changes in Greece.