Swithelm was King of Essex from 660 to 664.

Swithelm succeeded King Sigeberht II

Sigeberht II of Essex

Sigeberht II, nicknamed the Good or the Blessed , was King of the East Saxons , in succession to his relative Sigeberht I the Little...

 after he, along with his brother Swithfrith, murdered him. They accused him of being too friendly toward Christians. In 662, however, he was persuaded to convert to Christianity by Aethelwald

Æthelwold of East Anglia

Æthelwold, also known as Æthelwald or Æþelwald , was a 7th century king of East Anglia, the long-lived Anglo-Saxon kingdom which today includes the English counties of Norfolk and Suffolk. He was a member of the Wuffingas dynasty, which ruled East Anglia from their regio at Rendlesham...

, king of East Anglia. After his death in 664, he was succeeded by his cousins Sighere

Sighere of Essex

Sighere was the joint king of the Kingdom of Essex along with his brother Sebbi from 664 to 683. He was outlived by Sebbi, who became the sole ruler of Essex after his death. Sighere and Sebbi were cousins of their predecessor Swithelm. While Sighere returned to paganism, Sebbi remained...

 and Sebbi

Sebbi of Essex

Sebbi was the joint King of Essex from 664 to 683 along with his brother, Sighere. After Sighere died, Sebbi became sole ruler of Essex until 694....

.