List of kings of Strathclyde
The list of the kings of Strathclyde concerns the kings of Alt Clut, later Strathclyde, a Brythonic kingdom in what is now western Scotland. The kingdom was ruled from Dumbarton Rock, Alt Clut, the Brythonic name of the rock, until around 870 when the rock was captured and sacked by Norse-Gaels from the kingdom of Dublin after a four-month siege.
Source: Wikipedia — List of kings of Strathclyde (CC BY-SA 4.0)