The Iclingas (also Iclings or House of Icel) were a dynasty of Kings of Mercia during the 7th and 8th centuries, named for Icel (also Icil), great-grandson of Offa of Angel, a legendary or semi-legendary migration age figure who was in turn considered a descendant of Woden. 
The Iclingas reached the height of their power under Offa of Mercia (r. 757–796), who achieved hegemony over the other Anglo-Saxon states, and proclaimed himself "King of the English", but the dynasty lost control of Mercia soon after his death. Penda, who became king of Mercia in about 626 and is the first king named in the regnal lists of the Anglian collection, and at the same time the last pagan king of Mercia, gave rise to a dynasty that supplied at least eleven kings to the throne of Mercia. Four additional monarchs were given an Icling pedigree in later genealogical sources but are now believed to have descended from the family by way of Penda's sister.
Icel himself is of doubtful historicity; if historical he would have flourished during the first half of the 6th century, during the later phase, or within living memory, of the Anglo-Saxon migration; despite the claims of ties from continental Angeln, Brooks (2003) has suggested the Iclings more likely to have come from local origins in Mercia. He suggested that before Penda they may have been rulers of a "small Midlands people" with around 300 to 600 hides of land. Icel's ancestry in genealogical tradition is as follows: Icel son of Eomer son of Angeltheow son of Offa son of Wermund son of Wihtlæg son of Woden. In this tradition, Icel is the leader of the Angles who migrated to Britain. Icel is then separated from the establishment of Mercia by three generations: Icel's son was Cnebba, whose son was Cynewald, whose son was Creoda, first king of Mercia.
Matthew Paris s.a. 527 reports "...pagans came from Germany and occupied East Anglia... some of whom invaded Mercia and fought many battles with the British..." This date, however, should perhaps be amended to 515. The Vita Sancti Guthlaci (Life of Saint Guthlac) reports Guthlac of Crowland to have been son of Penwalh, a Mercian who could trace his pedigree back to Icel.
Several place names in England have been suggested as derived from the name of with Icel or the Iclingas, including Icklingham, Ickleford, Ickleton and Ixworth. Norman Scarfe noted that the Icknield Way had early spellings Icenhylte weg and Icenhilde weg and suggested a connection between Icklingham and the Iceni, although Warner (1988) has cast doubt on the identification. The name Iclinga survives as "Hickling" and several similar spellings.
The following are Iclinga kings of Mercia whose historicity is certain. Creoda of Mercia is of uncertain historicity (if historical, he would date to the end of the 6th century). Cearl of Mercia who ruled during the early 7th century was probably not an Icling.
|Penda||c.626–655||Son of Pybba. Raised Mercia to dominant status amongst the Anglo-Saxon kingdoms. Last pagan ruler of Mercia. Killed in battle by Oswiu of Northumbria.||15 Nov 655|
|Eowa||c.635–642||Son of Pybba. Co-ruler. Killed in battle.||5 Aug 642|
|Peada||c.653–656||Son of Penda. Co-ruler in the south-east Midlands. Murdered.||17 Apr 656|
|Wulfhere||658–675||Son of Penda. Restored Mercian dominance in England. First Christian king of all Mercia.||675|
|Æthelred I||675–704||Son of Penda. Abdicated and retired to a monastery at Bardney.||716|
|Cœnred||704–709||Son of Wulfhere. Abdicated and retired to Rome.||?|
|Ceolred||709–716||Son of Æthelred I. Probably poisoned.||716|
|Ceolwald||716||Presumed son of Æthelred I (may not have existed).||716|
|Æthelbald||716–757||Grandson of Eowa. Proclaimed himself King of Britain in 736. Murdered by his bodyguards.||757|
|Offa||757–796||Great-great-grandson of Eowa. The greatest and most powerful of all Mercian kings, he proclaimed himself King of the English in 774, built Offa's Dyke, and introduced the silver penny.||26 or 29 Jul 796|
|Ecgfrith||787–796||Son of Offa. Co-ruler, died suddenly a few months after his father.||14 or 17 Dec 796|
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