According to Welsh legend, the first name of the island of Britain. It was conquered, and became known as the Island of Honey.
Ostensibly, the name would seem to refer to Myrddin or Merlin, but one would assume that the earliest name of the island would necessarily precede the sixth-century Myrddin. This suggests that, in origin, Myrddin may have been something more than a warrior or mad prophet.
Myrddin’s Precinct appears in the Welsh Trioedd ynys Prydein and has been taken by some to indicate that Myrddin was, in origin, a deity with territorial rights.
See also
Prydein | The Legend of King Arthur
Source
Triads of the Island of Britain (Welsh ”Triads”) | 11th century to 14th century