original 1908 article reporting their discoveries is online. The most interesting thing about the plan above is all the features marked H, which were small stone-lined hearths perhaps used for smithing or smelting iron.
Jacquetta Hawkes in A Guide To The Prehistoric And Roman Monuments In England and Wales, says of this site that: “Within a stout enclosure wall, there is a group of houses, two of them circular, but the rest rectangular in plan and all spacious, splendidly built and almost intact. Nearly all the walls show a massive construction with an inner and outer facing of large slabs and a packing of smaller stones. Din Lligwy shows signs of having buildings of more than one period, but it is known to have been inhabited during the Roman occupation down to the fourth century A.D.; it must surely have been the stronghold of some chieftain of unusual standing—one would like to think that the lord himself lived in the larger round house, a place quite worthy to rank as a Celtic palace.”Since the inner diameter of that larger house is 21 feet (6.4 m), you can see that Celtic chiefs did not live in very luxurious homes.