However, problems with resupply in the event of siege and its destruction by Llywelyn ap Gruffudd, Prince of Wales in 1263 to prevent it falling into King Edward's hands, led to a new castle being built across the water in Conwy town.
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The output of this remote site was initially taken by horse pack to the quays on the River Conwy at Dolgarrog.
The River Conwy, after which the county borough is named, lies wholly within the area: rising in Snowdonia and flowing through Llanrwst and Trefriw en route to the Irish Sea by Conwy.
The village of Trefriw (noted for its spa, first used by the Romans), is still served by the station by way of the Gower suspension footbridge over the River Conwy, a rural walk of about one mile.
Waterloo Bridge, which carries the A5 across the River Conwy to Betws-y-Coed, was built by Thomas Telford in 1815, the year of the Battle of Waterloo, and is made wholly from cast iron.
Undaunted, Henry proceeded as far as the river Conwy, and began building a new castle at Deganwy.