Traditionally the kingdom has been seen as centred on central Scotland, equivalent to the Kingdom of the Southern Picts, with a heartland perhaps in Strathearn. Over the last century or so this has become a scholarly consensus. However, new research by Alex Woolf seems to have destroyed this consensus, if not the idea itself. As Woolf has pointed out, the only basis for it had been that a battle had taken place in Strathearn in which the Men of Fortriu had taken part. This is an unconvincing reason on its own, because there are two Strathearns — one in the south, and one in the north — and, moreover, every battle has to be fought outside the territory of one of the combatants. By contrast, a northern recension of the Anglo-Saxon Chronicle makes it clear that Fortriu was north of the Mounth (i.e., the eastern Grampians), in the area visited by Columba. The long poem known as The Prophecy of Berchán, written perhaps in the 12th century, but purporting to be a prophecy made in the Early Middle Ages, says that Dub, King of Scotland was killed in the Plain of Fortriu. Another source, the Chronicle of the Kings of Alba, indicates that King Dub was killed at Forres, a location in Moray. Moreover, additions to the Chronicle of Melrose confirm that Dub was killed by the men of Moray at Forres.