Kakko (died 617) was the joint duke of Friuli

Duke of Friuli

The dukes and margraves of Friuli were the rulers of the Duchy and March of Friuli in the Middle Ages.The dates given below, when contentious, are discussed in the articles of the respective dukes.-Lombard dukes:* 568–c.584 Grasulf I...

 with his elder brother Tasso

Tasso of Friuli

Tasso was the joint Duke of Friuli with his younger brother Kakko from their father's death to their own. Their father was Gisulf II. In or around 611, Gisulf was killed fending off an Avar invasion....

 from their father's death (611) to their own. Their father was Gisulf II

Gisulf II of Friuli

Gisulf II was the Duke of Friuli from around 591 to his death. He was the son and successor of Gisulf I.Gisulf and Gaidoald of Trent were at odds with King Agilulf until they made peace in 602 or 603. Gisulf also allied with the Avars to make war on Istria....

. In or around 611, Gisulf was killed fending off an Avar

Eurasian Avars

The Eurasian Avars or Ancient Avars were a highly organized nomadic confederacy of mixed origins. They were ruled by a khagan, who was surrounded by a tight-knit entourage of nomad warriors, an organization characteristic of Turko-Mongol groups...

 invasion.

Kakko and Tasso, along with their brothers Radoald

Radoald of Benevento

Radoald was the duke of Benevento from 646 to his death in 651. His elder brother, Aiulf was mentally unstable and Radoald and their younger brother Grimoald were regents. Radoald and Grimoald were brothers as younger sons of Gisulf II of Friuli...

 and Grimoald

Grimoald I of Benevento

Grimoald I was duke of Benevento and king of the Lombards .Born probably before 610 to Duke Gisulf II of Friuli and the Bavarian princess Ramhilde, daughter of Duke Garibald I of Bavaria, he succeeded his brother Radoald as duke of Benevento...

, escaped the Avars and evaded capture, successfully setting themselves up as Gisulf's successors. During their reign, they ruled over the Slavs of the valley of the Gail

Gail

-Given name:*Gail Borden , American inventor*Gail Collins , American journalist*Gail Cronauer , American actress*Gail Devers , American athlete*Gail Ann Dorsey , American musician...

 up to Matrei and imposed a tribute upon them. Tasso and Kakko were treacherously killed one day by Gregory

Gregory (exarch)

Gregory was an Exarch of Ravenna .Gregory succeeded Theodore I Calliopas as Exarch. His tenure is mostly known for his support of the Archbishop of Ravenna in the latter's struggles with the papacy over the independence of the sea...

, exarch of Ravenna. The exarch, having invited Tasso to Oderzo

Oderzo

Oderzo is a town and comune in the province of Treviso, Veneto, northern Italy.It lies in the heart of the Venetian plain, about 66 km to the northeast of Venice...

 for a ceremonial beard-cutting, had him and his brother hunted down and killed. Radoald and Grimoald fled to Arechis I of Benevento

Arechis I of Benevento

Arechis I was the second duke of Benevento from 591 to his death in 641, a reign of half a century. He was from Friuli and was a relative of the dukes there, maybe a nephew of Zotto, his predecessor. He was appointed by King Agilulf in the spring of 591, after Zotto's death...

 and Friuli passed to their uncle Grasulf II

Grasulf II of Friuli

Grasulf II, son of Duke Gisulf I, was the Duke of Friuli after the assassination of his nephews, Tasso and Kakko, in Oderzo in 616 or 617. His other nephews, Radoald and Grimoald, left Friuli for the Duchy of Benevento because they did not wish to live under Grasulf. Nothing more is known about...

.

Sources

• Paul the Deacon
  Paul the Deacon
  Paul the Deacon , also known as Paulus Diaconus, Warnefred, Barnefridus and Cassinensis, , was a Benedictine monk and historian of the Lombards.-Life:...
  
  . Historia Langobardorum. Available at Northvegr.