Pellitus was a Spanish astrologer of the seventh century, who worked for Edwin of Northumbria

Edwin of Northumbria

Edwin , also known as Eadwine or Æduini, was the King of Deira and Bernicia – which later became known as Northumbria – from about 616 until his death. He converted to Christianity and was baptised in 627; after he fell at the Battle of Hatfield Chase, he was venerated as a saint.Edwin was the son...

, in the account given by Geoffrey of Monmouth

Geoffrey of Monmouth

Geoffrey of Monmouth was a cleric and one of the major figures in the development of British historiography and the popularity of tales of King Arthur...

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Pellitus was engaged for Edwin's struggle against Cadwallon ap Cadfan

Cadwallon ap Cadfan

Cadwallon ap Cadfan was the King of Gwynedd from around 625 until his death in battle. The son and successor of Cadfan ap Iago, he is best remembered as the King of the Britons who invaded and conquered Northumbria, defeating and killing its king, Edwin, prior to his own death in battle against...

. After Pellitus was assassinated by Brian, nephew of Cadwallon, military matters went much worse for Edwin, who was killed at the Battle of Heathfield, in 633.