Assertion: kingdom's ruler | /r/HasProperty | the lands of roman britain
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text: I's conquest was brutal and the subsequent repression considerable, as the magnificent Welsh castles such as Conwy, Harlech, and Caernarfon attest; but this event re-united under a single ruler the lands of Roman Britain for the first time since the establishment of the Kingdom of the Jutes in Kent in the 5th century, some 700 years before.