Who was the first person to write about the British Isles?

[Wicked Blue]

4. A number of places have been thought to be Ultima Thule

Wikipedia: Thule (/ˈθjuːliː/[1] Greek: Θούλη, translit. Thoúlē; Latin: Thūlē is the farthest north location mentioned in ancient Greek and Roman literature and cartography. Modern interpretations have included Orkney, Shetland, northern Scotland, the island of Saaremaa (Ösel) in Estonia,[2][3] and the Norwegian island of Smøla.

Another hypothesis, first proposed by Lennart Meri in 1976, holds that the island of Saaremaa (which is often known by the exonym Osel) in Estonia, could be Thule. That is, there is a phonological similarity between Thule and the root tule- "of fire" in Estonian (and other Finnic languages). A crater lake named Kaali on the island appears to have been formed by a meteor strike in prehistory.[2][3][26] This meteor strike is often linked to Estonian folklore which has it that Saaremaa was a place where the sun at one point "went to rest".