The Archimandrite Fr. Gennadios Themelis, originally from the island of Kalymnos, was the Parish Priest of St. Nicholas Church at the time. He served the Greek Community in Cardiff from 1917 up to 1928. He had studied psychology at Brussels University; he was very well equipped in the Byzantine Church Music and had written and published a number of books and articles. In South Wales he organised the Greek Education and established Schools in Cardiff and Barry. He was very well respected by his congregation. In 12th December 1928 Fr. Gennadios had fallen asleep. He is the only Greek Orthodox Priest who had died and was buried in Cardiff.
Source : https://anastasiosds.blogspot.co.uk