Neithon, King of Strathclyde
(Died c.AD 625)
(Welsh: Nudd; Latin: Natanus; English: Nathan)

Neithon map Guidno succeeded St. Constantine - the young grandson of his older cousin, Tutgual - as King of Strathclyde. He is sometimes identified with King Nechtan of the Picts. The two were certainly contemporaries. Neithon died about AD 630 and was succeeded by his son, Bili. His independent line of Kings of Strathclyde continued until the 11th century.