E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
has no connection with the Homeric Troy, but means a maze, labyrinth, or bower. (Welsh troi, to turn; troedle, a trodden place [? street], whence the archaic trode, a path or track; Anglo-Saxon thraw-an, to twist or turn.) There are numerous Troys and Troy-towns in Great Britain and North America. The upper garden of Kensington Palace was called the siege of Troy.
A Troy-town is about equivalent to Julians Bower, mentioned in Halliwells Archaic Dictionary.