Fer Corb son of Mug Corb, was, according to medieval Irish legend and historical tradition, a High King of Ireland

High King of Ireland

The High Kings of Ireland were sometimes historical and sometimes legendary figures who had, or who are claimed to have had, lordship over the whole of Ireland. Medieval and early modern Irish literature portrays an almost unbroken sequence of High Kings, ruling from Tara over a hierarchy of...

. He came to power after killing his predecessor, and his father's killer, Irereo

Irereo

Irereo Fáthach , son of Meilge Molbthach, was, according to medieval Irish legend and historical tradition, a High King of Ireland. He took power after killing his predecessor, Óengus Ollom, and ruled for seven or ten years, until he was killed in Ulster by Fer Corb, son of Mug Corb...

, in Ulster

Ulster

Ulster is one of the four provinces of Ireland, located in the north of the island. In ancient Ireland, it was one of the fifths ruled by a "king of over-kings" . Following the Norman invasion of Ireland, the ancient kingdoms were shired into a number of counties for administrative and judicial...

. He ruled for eleven years, until he was killed by Irereo's son Connla Cáem

Connla Cáem

Connla Cáem , also known as Connla Cruaidchelgach , son of Irereo, was, according to medieval Irish legend and historical tradition, a High King of Ireland. He came to power after he killed his predecessor, and his father's killer, Fer Corb, and ruled for four years, until he died in Tara, and was...

. The Lebor Gabála Érenn

Lebor Gabála Érenn

Lebor Gabála Érenn is the Middle Irish title of a loose collection of poems and prose narratives recounting the mythical origins and history of the Irish from the creation of the world down to the Middle Ages...

synchronises his reign with that of Ptolemy IV Philopator

Ptolemy IV Philopator

Ptolemy IV Philopator , son of Ptolemy III and Berenice II of Egypt was the fourth Pharaoh of Ptolemaic Egypt...

 of Egypt

Ptolemaic Egypt

Ptolemaic Egypt began when Ptolemy I Soter invaded Egypt and declared himself Pharaoh of Egypt in 305 BC and ended with the death of queen Cleopatra VII of Egypt and the Roman conquest in 30 BC. The Ptolemaic Kingdom was a powerful Hellenistic state, extending from southern Syria in the east, to...

 (221-205 BC). The chronology of Geoffrey Keating

Geoffrey Keating

Seathrún Céitinn, known in English as Geoffrey Keating, was a 17th century Irish Roman Catholic priest, poet and historian. He was born in County Tipperary c. 1569, and died c. 1644...

's Foras Feasa ar Éirinn dates his reign to 330-319 BC, the Annals of the Four Masters

Annals of the Four Masters

The Annals of the Kingdom of Ireland or the Annals of the Four Masters are a chronicle of medieval Irish history...

to 474-463 BC.