Valuk (Latin: Wallucus dux) was the slavic duke in the independent land of the Alpine Slavs or Carantania.
[2] After the attempt to capture Constantinople in 626 failed, the Avars turned towards the west and attacked the territory settled by Slavs.
[3] At the latest after the weakening of Pannonian Avars in 626 (if not already in 623), Slavs in the Eastern Alps joined the Slavic tribal association of the Duke Samo.
[8] It is also possible that Valuk was the prince of the Alpine Slavs, where Arnefrit, the son of Friulian Duke Lupa, sought political asylum and alliance.
[4][6] In describing Arnefrit's withdrawal to the Slavs, Paul the Deacon claimed that he fled to the Slavs in Karnuntum, mistakenly called Karantanum (Carnuntum, quod corrupte vocifier Carantanum),[4] which could mean that the land began to be called Carantania under Valuk's rule.