Ljusneälf was a 1,391 GRT cargo ship that was built in 1917 as Tilburg by L Smit & Zoon, Kinderdijk for Dutch owners.

She was seized by the Allies in April 1945, passed to the Ministry of War Transport (MoWT) and renamed Empire Conquest.

In 1960, she was sold to Panamanian owners and renamed Costance, serving until 1966 when she ran aground at Lampedusa Island, Italy and was declared a total loss.

On 8 November 1922,[2] she was sold to Baltische Reederei, Hamburg and was renamed Ljusneälf ("Ljusnan River").

[2] In 1951, Southern Island was sold to Ubaldo Gennari fu Torquato & Co, Rimini, Italy and was renamed Verax (Latin: "truthful").

In 1960, she was sold to Compagnia de Navigazione Caribbean Cargo Carriers, Panama and was renamed Costance,[5] operating under the management of Ubaldo Gerrari fu Torquato & Co.[2] In 1962, she was sold to Compagnia de Navigazione Costance SA, Panama[7] and operated under the management of Vittorio Morace, Naples.

On 21 April 1966, Costance was on a voyage in ballast from Naples to Sfax, Tunisia, when she ran aground on Lampedusa Island, Italy, in stormy weather,[2] and subsequently sank.