A "legatus" was a high-ranking official in ancient Rome, often serving as an ambassador or envoy. They were typically appointed by the Roman Senate or the Emperor to represent Roman interests in foreign territories or during military campaigns. The role was crucial for maintaining diplomatic relations and overseeing provincial governance. In a military context, a legatus could command a legion and was responsible for strategic decisions and troop management. They acted as a liaison between the Roman army and local leaders, ensuring that Roman policies were implemented effectively in conquered regions.