The Battle of Dun Nechtain or Battle of Nechtansmere (Old Welsh: Gueith Linn Garan) was fought between the Picts, led by King Bridei Mac Bili, and the Northumbrians, led by King Ecgfrith, on 20 May 685. The Northumbrian hegemony over northern Britain, won by Ecgfrith's predecessors, had begun to disintegrate. Several of Northumbria's subject nations had rebelled in recent years, leading to a number of large-scale battles against the Picts, Mercians and Irish, with varied success. After sieges of neighbouring territories carried out by the Picts, Ecgfrith led his forces against them, despite advice to the contrary, in an effort to reassert his suzerainty over the Pictish nations. A feigned retreat by the Picts drew the Northumbrians into an ambush at Dun Nechtain near the lake of Linn Garan. The battle site has long been thought to have been near the present-day village of Dunnichen in Angus. Recent research, however, has suggested a more northerly location near Dunachton, on the shores of Loch Insh in Badenoch and Strathspey. The battle ended with a decisive Pictish victory which severely weakened Northumbria's power in northern Britain. Ecgfrith was killed in battle, along with the greater part of his army. The Pictish victory marked their independence from Northumbria, who never regained their dominance in the north. Background During the seventh century AD, the Northumbrians gradually extended their territory to the north. The Annals of Tigernach record a siege of "Etain" in 638, which has been interpreted as Northumbria's conquest of Eidyn (Edinburgh) during the reign of Oswald, marking the annexation of Gododdin territories to the south of the River Forth. To the north of the Forth, the Pictish nations consisted at this time of the Kingdom of Fortriu to the north of the Mounth, and a "Southern Pictish Zone" between there and the Forth. Evidence from the eighth century Anglo-Saxon historian Bede points to the Picts also being subjugated by the Northumbrians during Oswald's reign, and suggests that this subjugation continued into the reign of his successor, Oswiu. Ecgfrith succeeded Oswiu as king of Northumbria in 670. Soon after, the Picts rose in rebellion against Northumbrian subjugation at the Battle of Two Rivers, recorded in the 8th century by Stephen of Ripon, hagiographer of Wilfrid. Ecgfrith was aided by a sub-king, Beornhæth, who may have been a leader of the Southern Picts, and the rebellion ended in disaster for the Northern Picts of