Anton Markussen & Anna Emilie Arnesen

Anton Markussen (born Grimstad, 1885) was married in Newport, South Wales in September 1910 to Anna Emilie Arnesen (born Newport,1886), daughter of my great grandfather Axel Arnesen, (born Fredrikshald, 1854). I can find no subsequent record of Anton & Anna in UK, and believe they may have returned to Norway. I would welcome help in tracing them and any descendants in Norway