Hussa of Bernicia
It is not entirely certain whether Hussa was the son of Ida, founder of the kingdom of Bernicia, or rather the leader of a rival Anglian faction. Little is known of Hussa's life and reign, however. At some point during his reign, the coalition forces of Rheged and the Brythonic kingdoms of Strathclyde, Bernicia and Elmet laid siege to Hussa and was almost successful in driving the Anglian Bernician kings out of Britain. It is thought this alliance ultimately failed due to arguments between the different British tribes culminating in the murder of Urien, the king of Rheghed, around 590 by his former ally, Morcant.
Nevertheless, there is some evidence from the Anglo-Saxon Chronicle that following Hussa's death, there was a schism between his family and that of Æthelfrith, Hussa's successor, for it states that Hering son of Hussa, led Áedán mac Gabráin's forces against Æthelfrith at the Battle of Degsastan in 603.
The years of Hussa's reign are conjecture: the earliest authorities differ widely on the order and the regnal years of the kings between the death of Ida and the beginning of Æthelfrith's rule in 592/593. Nennius says that Hussa ruled for seven years, and while the dates of 585 to 592 have been estimated they are uncertain. Hussa's exact place in the Bernician genealogy is unclear. 
- Brian Hope-Taylor, Yeavering: an Anglo-British centre of early Northumbria (1977), pp. 292-293
- John Ashton Cannon, Anne Hargreaves, The Kings & Queens of Britain (2009), p. 51