The graveyard at St David's Church, Llywel is large and most people from Llywel and Trecastle and the outlying farms have been buried there for centuries. There is an ancient 'wake way' or 'coffin road' which comes down from the mountain opposite the church, where coffins of the deceased from outlying farms were carried down for burial in the churchyard.
There is another smaller church at Traenglas which I believe also has burials, and another at Cray. There are also the chapels, too, where your ancestors could have been buried if they went to chapel. The Traenglas church is interesting because, according to local information, there was a falling-out between the local gentry and the vicar of Llywel, so the gentry removed their support from St David's, and went and built their own church at Traenglas!
Regards
GS