Union Bank was a bank operated by the firm of Bateman & Co. and it is listed in the for 1807. However, the date of establishment of the bank is unknown. By December 1813, bank notes indicate that the business was being carried on under the style of Mathias, Lloyd, & Bowen. The partners were John Mathias, of Prendergast, Pembrokeshire, and Herbert Lloyd and Thomas Bowen, both of Haverfordwest.