The Horologion of Andronikos, also known as The Tower of the Winds, called today by Greeks, The Aerides, 'The Winds', is set within the Roman Agora, Athens. Constructed from Marble in the 2nd century BC by the Syrian astronomer Andronikos Kyrrestes, it was built as a combined weather vane and water clock. In all there are 8 friezes personifying the eight winds. The tower stands 12m high and has a diameter of 8m. Boreas is perhaps the best know of the winds, the ancient Greek personification of the cold north wind and he is shown here blowing through a large conch shell. The remaining winds depicted on the other panels are: Skiron, Zephyros, Lips, Notos, Euros, Apeliotes, Kaikias. The remaining winds depicted on the other panels are: Skiron, Zephyros, Lips, Notos, Euros, Apeliotes, Kaikias.