The quadrireme would be looking around for any enemy ships. Pliny the Elder reports that Aristotle ascribed the invention of the quadrireme (Latin: quadriremis; Greek: τετρήρης, tetrērēs) to the Carthaginians.[27] Although the exact date is unknown, it is most likely the type was developed in the latter half of the 4th century BC.[28] Their first attested appearance is at the Siege of Tyre by Alexander the Great in 332 BC,[29] and a few years later, they appear in the surviving naval lists.