There's a Portuguese saying "há mouro na costa" which is literally "there are moor at the coast" and means that there is something fishy going on.

In an alternate timeline, The Sea Peoples are Romans sailing to England, the Anglo-Saxons, the Normans. Things became fuzzy when the English themselves became other civilization's Sea Peoples.

I wish the author would go into detail about the sea peoples. From what I read, one theory is that they were subject allies of the Hittites; once the Hittites collapsed they went in search of better farmland with their entire families.