Thank you for the query. I believe if you were to invest in a book named "The Port of Caernarfon 1793 - 1900 (274 pp.)by the late historian Lewis Lloyd you can be provided with the details that you require. It can be purchased from th Seiont II Museum,Caernarfon, for the the sum of £5 plus p.& p. If my memory serves me well I believe you will find that the two street names/areas mentioned as having houses of ill repute in them are are Mill Lane and Tanrallt.

May I also suggest that you contact Mr Rhys Prytherch, Chairman of the Seiont II Museum, Ty Fry,
Constantine Road, Caernarfon, who will be able to arrange for you to obtain a copy.

Regards,

T Meirion Hughes,
Resident Historian,
Caernarfon Online.

thank you I will get the book