Roman swords

The first Roman swords we're actually straight bladed, single edged weapons imported from Korea and China known as chokuto, which were later replaced with the curved blade variety at the end of the 8th Century. The name of the curved blade swords which replaced them was Tachi. The reason for this transformation was roman swords found that a curved sword could be drawn from the scabbard more swiftly and provided a far more effective cutting angle.