Wyvern wyvern is thought to have derived from the figure of the dragon encountered by Trajan's legions in Dacia. It may be the origin of the red dragon of Wales and the golden dragon of the Kingdom of Wessex carried at the Battle of Burford in AD 752. The concept of winged snakes is common in cultures around the Mediterranean, with a notable example being the Egyptian goddess Wadjet. The oldest creatures outright referred to as "winged dragons" are Helios' chariot steeds, which aid Medea. Wyverns are very similar to dragons, and in many languages, cultures and contexts no clear distinction
Westland Wyvern (and equally troubled) Blackburn Firebrand. Several second-line squadrons also received Wyverns around this time. Total production was 127 airframes with 124 aircraft completed, as the last three Eagle piston-engined airframes, VR138, -139, and -140, were never completed. The first carrier trials were carried out by the first pre-production Wyvern TF.2 aboard on 21 June 1950. Despite this, when the Wyvern S.4 entered service with 813 Naval Air Squadron in May 1953, it had not obtained clearance for carrier operations, this being obtained only in April 1954. The Wyvern was in service with the Fleet Air Arm from 1954 to 1958.