Kocel

[1] In 861, Kocel made a significant donation to the Freising monastery, showing that he had a solid social and political standing.

[7] Hadrian II appointed Methodius the archbishop of Sirmium, and sent confirmations to, among others, Kocel, whose land lay within the jurisdiction.

[9] In 874, following the Moravian conflict, Kocel continued to rule the Drava Valley, presumably under Carloman of the March of Pannonia.

[11] Some historians consider that Kocel can be identified with Frankish military commander Kotzil mentioned in De Administrando Imperio regarding the armed revolt by the Croats (presumably in the time of Duke Domagoj) who "managed to prevail and killed all the Franks and their archon, called Kotzil" (also identified with Cadolah of Friuli d. 819), most probably in 874 which coincides with Kocel's disappearance from the sources.

[12][13] According to Francis Dvornik, the DAI's account is possibly "telescoping" different events related to Ljudevit, Borna, and finally in which Kocel "had perished in 876".