King Rodulf was king of the Heruli kingdom on the Middle Danube in the period around 500, and possibly of Scandinavian origin. He died in a battle with the neighbouring Lombards which led to the splitting up of the Heruli. He is probably the same Heruli king that Theoderic the Great wrote to in two surviving letters, in one of which Theoderic "adopted" him with a gift of arms. Less certainly, he is also sometimes equated to a King Rodulf that Jordanes mentions as having come from Scandinavia to Italy, to join Theoderic.