Isidore Wartski

At one point he was the mayor of Bangor. See: https://en.wikipedia.org/wiki/Bangor,_Gwynedd#Retail_trade

Not to be confused with his first cousin of the same name [Isidore Wartski], who was a noted scholar.

One of the most well-known Welsh Jewish families was the Wartski family. However, you won’t find them in this directory as the town they lived in, Bangor, is not listed. The Bangor Hebrew Congregation was only founded in 1894, the date the Commercial Directory was published, although by 1895, it had twelve seatholders according to “The Jewish Year Book 1896/97”. It was Morris Wartski, who had first come to Wales in 1865 from Turek, Poland, and set up business in Bangor. His son, Isidore (1879-1965), the most prominent Wartski family member, became the first Jewish Mayor in Wales (1939-1941).