Legionaries were soldiers in the ancient Roman army, specifically part of a unit called a legion. Each legion typically consisted of around 5,000 men, and legionaries were known for their discipline, training, and organization. They played a crucial role in expanding and protecting the Roman Empire through military campaigns. To become a legionary, a soldier had to be a Roman citizen and meet certain physical requirements. They were equipped with armor, shields, and weapons like the gladius, a short sword. Legionaries were not only fighters but also builders, helping to construct roads, forts, and other infrastructure throughout the empire.