Vortigern was a 4,797 GRT combined train and roll-on/roll-off ferry built by Swan Hunter in 1969 for the British Railways Board.

On 22 May 1971, Vortigern was chartered by the International Railway Congress and made a voyage from Southend Pier Essex to Greenwich, London.

After repairs in Amsterdam, Netherlands,[2] which cost over £1 million,[10] she returned to service on 22 April.

From April to June she was operated on the Dover - Calais route under charter to Townsend Thoresen,[2] following the loss of the Herald of Free Enterprise on 6 March 1987.

[8] Following the entry of Pride of Dover into Townsend Thoresen service,[11] Vortigern was then laid up in the River Fal, Cornwall.

[2] On 1 April 1988, Vortigern was sold to Lindos Line SA, Piraeus, Greece and was renamed Milos Express (Greek: ΜΗΛΟΣ ΕΞΠΡΕΣ).

She was renamed Express Milos (Greek: ΕΞΠΡΕΣ ΛΗΜΝΟΣ) in January 2000 and entered service under the Hellas Ferries brand, continuing on the same route.

[2] In May 2003, Express Milos was sold to Saos Shipping Company and renamed Nisos Lemnos.

The ship was reflagged to Saint Vincent and the Grenadines in December 2004 and renamed Limon.