The ancient empire known for its military innovations and expansion into Europe is the Roman Empire. Renowned for its well-organized and disciplined military, the Roman legions played a crucial role in the empire's success and territorial expansion. Innovations such as advanced battlefield tactics, engineering of roads, and the development of siege weaponry facilitated conquest and integration of new territories. The Roman Empire's expansion into Europe brought significant changes to culture, governance, and infrastructure, influencing the rise of various European civilizations. Its military legacy continues to be studied in military academies worldwide.