Theodelap was one of the sons of Faroald

Faroald I of Spoleto

Faroald I was the first Duke of Spoleto, which he established during the decade of interregnum that followed the death of Alboin's successor . He led the Lombards into the centre of the Italian peninsula while Zotto led them into the south.In 579, he sacked Classis, the harbour of Ravenna...

, the first Duke of Spoleto. After the death, in 601 or 602, of Ariulf

Ariulf of Spoleto

Ariulf was the second Duke of Spoleto from 592 to his own death.In 592, Ariulf, whose position at Spoleto and control of key points along the Via Flaminia, the key communication between Ravenna and Rome, to cut its alternative, the fortified Via Amerina, and capture several Byzantine cities...

, Theodelap and his brother fought for the throne and, after his victory, Theodelap was crowned duke. He held the dukedom for more than half a century, until his death. His reign was nevertheless uneventful and he appears to have been largely or completely independent of royal authority throughout it. He was succeeded by Atto

Atto of Spoleto

Atto was the Duke of Spoleto from 653 to 663, the successor of Theodelap.Nothing is known of his reign except that he was replaced by Thrasimund, Count of Capua.-Sources:*Paul the Deacon. ....

.

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.