History and Archaeology Slate has been quarried in the area for over 1800 years; the Romans who lived in Segontium (Caernarfon) used slate from local quarries to build their fort. Hundreds of years later King Edward 1 of England built a series of castles along the North Wales coast and slate from the Conwy Valley was used in the castles of Conwy, Beaumaris and Caernarfon.sles.

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