Fortriu (Latin: Verturiones; Old Irish: *Foirtrinn; Old English: Wærteras; Pictish: *Uerteru) was a Pictish kingdom recorded between the 4th and 10th centuries. It was traditionally believed to be located in and around Strathearn in central Scotland, but is more likely to have been based in the north, in the Moray and Easter Ross area. Fortriu is a term used by historians as it is not known what name its people used to refer to their polity. Historians also sometimes use the name synonymously with Pictland in general.
The only survived indigenous writings left by the people of Fortriu are ogham inscriptions, but the name they used to describe themselves is unrecorded. They were first documented in the late 4th century by the Roman historian Ammianus Marcellinus, who referred to them in Latin as the Verturiones (or Vecturiones). The Latin root verturio has been connected etymologically by John Rhys with the later Welsh word gwerthyr, meaning "fortress", suggesting that both came from a Common Brittonic root vertera, and implying that the group's name meant "Fortress People". Mallory & Adams saw the name as representing tu(:)rjones, derived from Indo European tur meaning "mighty", with the intensive prefix *wer. A reconstructed form in the Pictish language would be something like *Uerteru.
A connected Old Irish form of the name appears from the 6th to the 10th centuries in the Annals of Ulster and later sources, which contain repeated references to rex Fortrenn, ("the King of Fortriu"), la firu Fortrenn ("the men of Fortriu") and Maigh Fortrenn ("the plain of Fortriu"), alongside references to battles occurring i Fortrinn ("in Fortriu"). These are examples of a common pattern of Goidelic languages rendering with an f what in Brittonic languages is U/V, W or Gw. The word Fortriu is a modern reconstruction of a nominative form for this word that has survived only in these genitive and dative cases. Anglo-Saxon sources, from the Anglo-Saxon Chronicle in the 6th century to Bede in the 8th century, refer to the group using the Old English form of the name Wærteras.
Modern scholars writing in English usually refer to the kingdom using the name Fortriu and the adjective Verturian, and use the name the Wærteras to refer to the people as an ethnic group.
Fortriu is first recorded by the Roman author Ammianus Marcellinus, who writing in c. 392 used the Latin name Verturiones to describe one of the two gentes or "peoples" of the Picts who took part in the Great Conspiracy of 367–368. Although alongside the Dicalydones they are clearly described as Pictish, at this time this may just have been a pejorative Roman word for unromanised Britons. The Verturiones were probably based like their successors around the Moray Firth. It is not clear what relationship they had to earlier peoples documented in the same area, such as the Vacomagi and Decantae surveyed under Agricola in the 1st century and listed in Ptolemy's Geography, but archeological discoveries at Birnie near Elgin indicate that Rome had remained in diplomatic contact with the area throughout the 2nd century.
The site of Norse attack on Burghead 866 lies on Permian sandstone, bedrock that formed in the Triassic. The rock here is major:{sandstone}, Minor{claystone,carbonates, consolidated,gypsum, anhydrite}.
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