Blaenconyn’s roots are to be found in two chapels, Rhydwilym and Ffynnon (Llanddewi Velfrey). Owing to the distance between the chapels worshippers in Llandissilio area early in the 19th century often held services on local farms, namely Llwyncelyn in Egremont, Tregendeg in Penffordd, Ty hen, Dyffrynconin, Penyrardd, Llwydyrys and Brynaeron. Due to the popularity of these services a local farmer, Rev. Theo Thomas, actually donated a plot of land and Blaenconyn chapel was completed in 1844. The congregation at that time must have been large, with 90 members being released from Ffynnon chapel to worship in Llandissilio.
Over the years they have had many distinguished ministers including Rev. D. J. Michael, who was ordained at Blaenconyn in 1909 and stayed for 53 years, a service record almost unique in the Pembrokeshire Baptist movement. He will be remembered as the driving force behind the re-building of the chapel in the 1930’s. Also associated with Blaenconyn Chapel was a British School which became part of the state system after 1870 and was eventually replaced by Brynconyn.
Amongst the many cultural activities associated with Blaenconyn, the most well known were the Semi-National Eisteddfodau, which were held in a marquee next to the chapel on Ty-hen field. The first of the series took place in 1922. Old programmes show as much as £100 in prize money being offered, together with a challenge cup for the chief choral and male voice competitions. Many choirs travelled from all over South Wales to compete, often arriving in Clynderwen by train. Llandissilio even had its own male voice choir which survived until after the 2nd World War, although numbers fell as low as 8. Unfortunately in 1932 the eisteddfodau made a loss and came to an end.