History in Structure

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Tower (Twr Bach)

A Grade II Listed Building in Rhosyr, Isle of Anglesey

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Latitude: 53.1343 / 53°8'3"N

Longitude: -4.4129 / 4°24'46"W

OS Eastings: 238680

OS Northings: 362398

OS Grid: SH386623

Mapcode National: GBR 5B.6GJ9

Mapcode Global: WH43C.5HX1

Plus Code: 9C5Q4HMP+PV

Entry Name: Tower (Twr Bach)

Listing Date: 30 January 1968

Last Amended: 19 October 1998

Grade: II

Source: Cadw

Source ID: 5552

Building Class: Maritime

Location: Located at the end of the breakwater at the SE extremity of Llanddwyn Island.

County: Isle of Anglesey

Community: Rhosyr

Community: Rhosyr

Locality: Llanddwyn Island

Traditional County: Anglesey

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Probably built late C18, the predecessor to the larger, more visible Twr Mawr (Llanddwyn Lighthouse) which was erected early C19 (probably between 1800 and 1823).


Circular day-mark tower, built as a landmark for shipping. Built of local rubble, with tapering walls and saucer dome; large square headed doorway at base.

Reasons for Listing

A good surviving example of a late C18 day-mark, and part of a group with the lighthouse, keepers' and pilots cottages nearby.

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