What was the field of Mars where the Roman army trained and assembled called?

The field of Mars where the Roman army trained and assembled is known as Campus Martius. This location, which translates to "Field of Mars," was situated outside the city boundaries of ancient Rome and provided ample space for military exercises, assemblies, and various public events. The Campus Martius was crucial for the Roman military's training, allowing soldiers to practice and prepare for warfare in a setting separated from urban life. This area was not only significant for military activities but also evolved over time to accommodate various cultural and athletic events, reflecting its importance in Roman society.

In contrast, Circus Maximus was primarily a chariot racing stadium, the Roman Forum served as the center of public life and commerce, and Palatine Hill was known for its association with the elite and the location of several important palaces.