Defectors

It must have been a shock when Thorkell the Tall, a leader and warrior of the early 12th-century Danish invasion of England, changed his stance and decided to join the English forces of King Æthelred the Unready, taking 45 ships' worth of loyal men with him. There is some reason to believe that Thorkell was married to a daughter of Æthelred, possibly Eadgyth.

As mercenaries for Æthelred, the Danes fought in 1013 against their former liege lord, King Sweyn Forkbeard of Denmark and his son, Cnut (who Thorkell had helped raise and educate). Sweyn was successful, forcing Æthelred into exile by the end of 1013. Sweyn died not long after, however, on 2 February 1014, and Cnut was declared his successor.

The remaining English nobles called Æthelred back from the continent to reclaim the throne (Cnut was back in Denmark). While Cnut was preparing a fleet to re-take England, Æthelred's eldest son Æthelstan died, making his second son Edmund Ironside the new heir to the throne of England.

Cnut's invasion arrived in September 1015 with numerous mercenaries and help from Poland and Sweden. Thorkell decided to leave the employ of Æthelred and join up with Cnut. While they plundered southern England, the elderly and ill Æthelred left leadership of the army to Edmund. Edmund's army was joined by an army raised by Eadric Streona, but Eadric betrayed Edmund and the English, convincing 40 ships to join Cnut.

During a Battle of Otford (near the village of Otford in Kent), Eadric defected from Cnut back to the English. This seems to have been simply a ruse, because at the following Battle of Assandun he defected again, leaving Edmund's army alone to fight Cnut. A majority of English nobility were killed, defeated by Cnut. 

For Thorkell's defection back to Cnut, he received East Anglia. Eadric received Mercia, but Cnut knew he could not be trusted. Eadric must have acted true to form for the dastardly fellow he was, because less than two years later Cnut had him beheaded.

Thorkell, again, had some falling out with Cnut, in 1021. Cnut banished Thorkell, who returned to Denmark. Fearing Thorkell's reputation as a powerful leader, Cnut didn't want Thorkell on his bad side forever, so he made him an earl of Denmark and foster-father to Cnut's son, Harthacnut.

Mentions of Thorkell end in 1023. The details of his death are unknown. One of his son's was in the retinue of Harthacnut, but after Harthacnut's death Thorkell's wife and sons were expelled from Denmark, suggesting there was suspicion on the family.

Now: mentioned several times but never discussed in detail, let's talk about Cnut's father and Thorkell's lord, Sweyn Forkbeard.