Roman Cybaea (50 BC), here with a prow with a protective spur.

The Cybaea or Kybaia in Greek was a bridged commercial vessel, relatively heavy, maneuvered to rowing for approaches or lack of wind, and equipped with two masts. There is no known representation but a few mentions taken from various ancient texts Romans and Greeks. According to Lionel Casson, this ship was also related to the Kerkouros (See Curcurus), but much larger and very crushed prow-like barges. The name related to "cubic" or angle would incline for a ship of mixed vocation, fluvial, like pontoon, and maritime at the same time, and walking with the oar and the sail.