1. Probably built 1802-8. Circular corner tower screening service courtyard to E. Tower and attached walls crenellated; battered base to tower. Dressed stone window surrounds, including one lancet. Attached walls run at right angles to tower and include cusped Gothic arch.
(Source: Site File AN/Domestic/SH28)
J Hill 07.11.2003

2. Depicted on the Second Edition Ordnance Survey 25-inch map of Anglesey XI, sheet 7 (1900). C.H. Nicholas. RCAHMW. 7th August 2006.