But it is highly probable that the stones were the remains of prehistoric monuments, similar in nature to Stonehenge and Avebury Circle, rather than proof of a giant's existence.
But what about the Baglan giantesses? In The Story of Taibach Evans, again, refers to Lhwyd's collection of MSS and the story of three sister giantesses who owned three castles, two in Baglan parish and the other in Margam parish. From east to west, Pen Castell in Margam Park, a Castell near Cwm Clais and Castell y Wiriones (Witch's Castle) on a westerly spur of Mynydd y Gaer. I guess giantesses need more space than most people and one parish just wasn't big enough for them all!
Dilic's supposed grave stones were located in lower Baglan, near the seaside, not far from the Old Road, an area that was covered by the high tide in centuries past. Today, some of the biggest stones in Baglan can be found in the park, opposite the library, the site of old Baglan Hall, built c.1600 and demolished in 1958.
Sources
The Story of Baglan (Port Talbot), A. Leslie Evans, privately published 1970
The Story of Taibach & District, A. Leslie Evans, first published privately 1963, reprinted 1982 by Alun Books, Port Talbot