Some of this post is allegorical in nature, although there are many links in the area with ancient Welsh lore.
Mynydd Dinas and Mynydd Emroch in port Talbot, Mynydd Dinas has Baglan to the west, St baglan was said to have studied under st Illtud in LlanIlltud fawr (Lantwit major) st Illtud said to be the cousin of Arthur. Also on Mynydd Dinas on later maps(O.S) you have Twyn Disgwylfa and Disgwylfa fawr, the great watchtower and the hill of the watchtower, with connotations towards watching and learning or teaching.
Some things are shown on some maps that are not on others, but with this they seem to have left off a whole mountain, Mynydd Emroch, I have tried to translate emroch to no avail, with the closest I could get was in relation to pentre moch just below the mountain, moch meaning pig, and this then being lent to the mountains name, but this did not sound correct because of the R in emroch.
So I took Dinas and emroch and combined to come up with Dinas Emrys (City of ambrosia, ambrosia being the food of the gods in ancient mythology), the famous mountain in welsh mythology where Merlin (Myrddin) is said to have given his prophecies. A stretch of the imagination I know, but if you combine emrys and moch, the first and last three letters of each, you get emroch.
Also the word moch means pig, more likely swine or boar in ancient times and the prophecies mention Arthur as the boar of cornwall or the golden boar?
In addition, some of the prophecies are also said to either directly relate to or are a continuation of the mabinogion tale of Lludd and Llevelys. Dragons feature in both stories, as a symbol and allegory, but in the mabinogion tale the dragons are turned into pigs/boars before they are entombed within the mountain. So you have emrys and moch mixed to make Emroch. The two mountains together Mynydd Dinas and Mynydd Emroch, would make Dinas Emrys and a pig : )
I believe this part of south wales has a far longer and grander history than what is commonly thought. There are many translations and many interpretations as always with mythology, allegory and the welsh language.