As a result Henry was crowned as joint king when he came of age.

Sigeheard was joint king of Essex along with his brother, Swaefred, from 694 to 709, succeeding their father Sebbi.

The favourite son of his father as a child, Philip was enthroned alongside Louis VI as joint king in 1129.

Whether or not Eadbald became a joint king with Æthelberht, there is no question that Æthelberht had authority throughout the kingdom.

Connad appears to have been joint king with Eochaid Buide in the 620s.

According to one account, he tried to ensure that his own son Giric would succeed him by making him joint king.

The Romans restored him as a joint king with Orophernes in 157 BC by dividing the kingdom.

He was succeeded by the joint kings Sighere and Sebbi.

Sighere was the joint king of the Kingdom of Essex along with his brother Sebbi from 664 to 683.

Amphion and Zethus seized power, ruling as joint kings of Thebes, and expelled Laius.