Drest mac Caustantín was king of the Picts

Picts

The Picts were a group of Late Iron Age and Early Mediaeval people living in what is now eastern and northern Scotland. There is an association with the distribution of brochs, place names beginning 'Pit-', for instance Pitlochry, and Pictish stones. They are recorded from before the Roman conquest...

, in modern Scotland

Scotland

Scotland is a country that is part of the United Kingdom. Occupying the northern third of the island of Great Britain, it shares a border with England to the south and is bounded by the North Sea to the east, the Atlantic Ocean to the north and west, and the North Channel and Irish Sea to the...

, from about 834 until 836 or 837. He was the son of King Caustantín

Caustantín of the Picts

Causantín or Constantín mac Fergusa was king of the Picts , in modern Scotland, from 789 until 820. He was until the Victorian era sometimes counted as Constantine I of Scotland; the title is now generally given to Causantín mac Cináeda...

 and succeeded his uncle, Óengus

Óengus II of the Picts

Óengus mac Fergusa was king of the Picts , in modern Scotland, from about 820 until 834. Tradition associates him with the cult of Saint Andrew and the Flag of Scotland....

, to the throne.

The length of his reign is based on the various Pictish king lists, where he is associated with Talorgan son of Uuthoil. Some sources, such as John of Fordun

John of Fordun

John of Fordun was a Scottish chronicler. It is generally stated that he was born at Fordoun, Mearns. It is certain that he was a secular priest, and that he composed his history in the latter part of the 14th century; and it is probable that he was a chaplain in the St Machar's Cathedral of...

, conflate the two kings as "Durstolorger", perhaps under the influence of the earlier "Dubthalorc

Talorgan II of the Picts

Talorgan was a king of the Picts. The Annals of Ulster report the death of Dub Tholargg king of the Picts on this side of the Mounth in 782. He is presumed to have been the son of Óengus mac Fergusa. He was succeeded by his son Drest.-External links:**...

".

It was once thought that Pictish kings in this period were also kings of Dál Riata

Dál Riata

Dál Riata was a Gaelic overkingdom on the western coast of Scotland with some territory on the northeast coast of Ireland...

, but this is no longer supported.