 In the year 870 AD, the annals record a Viking raid on Dumbarton Rock; after this point, the kings of Clyde Rock are no longer discussed.In 872 AD, the Annals of Ulster instead refer to the kingdom of Ystrad Clud, better known as the kingdom of Strathclyde, which appears to mark the shift of political power from Dumbarton Rock further upstream to Govan.It is possible that a predecessor of the 12th century royal estate at Partick and the now-destroyed Doomster Hill (which is thought to have functioned as a moot hill or meeting place) played a part in this power shift.