But then that doesn't explain why the Egyptians didn't know who the Sea peoples were or found them so alien, surely having had contact with all the former and knowings of what's happening in those regions, they would know who they are if they were Hittite / ex Hittite subjects?If you read the texts at Medinet-Habu, not many read all the texts, but if you do you will see where Ramesses III claims to have been given the sword (ie; authority) to invade that land of Hatti.
The reliefs show Egyptian forces besieging the island city of Arvad - a longtime Hittite supporter, and, attacking "Tunip of Hatti".
Therefore it was Ram. III who moved against the Hittites by crossing into Syria. The reliefs at Medinet-Habu show Hittites, identifiable by their long gowns, receding forehead, and long hair. Comparable with figures in the Seti reliefs.
Syrian Hittites were not Anatolian Hittites, it would appear this engagement by Ram. III was after the Hittite Empire had collapsed.
The list of 'nations' traditionally believed to have fallen victim to the onslaught of Sea Peoples, ie; Hatti, Kode, Carchemish, Arvad [not Arzawa] & Alishaya, are all Hittite.
[note: Arzawa is an error, Arzawa did not exist in the 12th century. Arzawa had been destroyed by Mursilis II some 200? yrs before Ram. III ]
What this list represents in my view is an alliance of Hittite states, their confederates were the Peleset, Danuna, Tursha, Sherden, Shekelesh, etc. (ie; the Sea Peoples).
It was Hatti, Kode, Carchemish, and Alishaya who will have presented the land forces.
Arvad (traditionally a naval concern), the Peleset, Danuna, Tursha, Sherden, Shekelesh, etc. provided the sea borne forces.