According to Greek myth, the prince Minos of Crete petitioned the god Poseidon for a sign that he would take the throne rather than his brother. Poseidon sent a magnificent white bull, on condition Minos sacrifice it. Being ignorant of the usual outcomes of trying to pull a fast one on the gods, King Minos decided to keep the bull and sacrifice another in its place.

Understandably, Poseidon got royally pissed off and decided to seek revenge by cursing Minos' wife Pasiphae to fall madly in love with the white bull. Unable to control her unnatural desire, Pasiphae asked the incredibly clever inventor Daedalus for help. Not one to be fazed by the predilections of his queen, Daedalus came up with the brilliant idea of building a hollow wooden cow, inside which Pasiphae could hide. He then stuck this in a pasture with the white bull, put on some Barry White LPs, and let nature take its course...

(There is a point to all this... really...)

Anyway, Pasiphae got pregnant, which just proves that old Poseidon was pretty slick when it came to genetic engineering. King Minos was happy, until the baby was born, and didn't have his strong Cretan chin. At first Minos suspected the milkman, but it soon became clear that the kid was actually half-bull. Not wanting to murder his wife's child, Minos did what any self-respecting man of morals would do, and ordered Daedalus to construct for him the Labyrinth - a maze of such cunning that no man or beast could find his way out - and threw the kid in there. He grew up on a diet of virgins to become the Minotaur.

The story goes on, and on, and on... and on... as all Greek legends do, but that's enough for our purposes today.

The Palace of Knossos is a major archaeological site on Crete, and the largest relic of Minoan civilisation. It is indeed large and maze-like, and is believed to be a possible source for the legend of the Labyrinth. People have tried searching the vicinity for an actual Labyrinth, but haven't come up with anything beyond the palace itself. If there really was a Labyrinth, it may still be hidden somewhere under the palace.

Of course with only the one Minotaur to worry about, they'd only need one Labyrinth, but they might have built one on Santorini too, just out of habit.