Was the triskelion associated with any particular Classical Greek City Greek City State or region. I know it is on the flag of modern Sicily but I'd be surprised if it dated back to the classic era. Or should I be painting up my Siciliot Hoplites with them?
It seems to date back beyond the classical era. Wikipedia has a brief but hopefully useful article (https://en.wikipedia.org/wiki/Triskelion).
If your Sicilian hoplites are going to bear this device, I suggest something closer to the original (https://en.wikipedia.org/wiki/Triskelion#/media/File:2009-03-22_03-29_Sizilien_683_Agrigent,_Parco_Valle_dei_Templi_Agrigento,_Museo_Archaeologico.jpg) rather than the AD 1282 version (https://www.thatsarte.com/media/catalog/product/cache/1/image/x600/8cd505534bc15f7008592d41c6b9f71d/h/a/handmade-decorative-tile-cs313l.jpg).
As to whether classical Sicilians, and if so which cities, used the triskelion - I do not know, but this (http://spiralforums.biz/uploads/monthly_06_2009/post-19351-1245566224.jpg) was posted as a Syracusan shield on this site (http://www.spiralforums.biz/index.php?showtopic=9513&page=7).
[Edit - fixed Wikipedia link, and would draw attention to Duncan's findings below.]
As a shield-device it is supposedly associated with the Athenian clan of the Alcmaeonids, known as "whitelegs" (https://books.google.co.uk/books?id=Uas8AAAAIAAJ&pg=PA21&lpg=PA21&dq=alcmaeonids+%22white+legs%22&source=bl&ots=RTkGCRCI2g&sig=nY1-6n7mbwolwKsrH1j-c0RV98U&hl=en&sa=X&ved=0ahUKEwiFoJ-Hq9TXAhVJVBQKHYUmBRYQ6AEIOjAI#v=onepage&q=alcmaeonids%20%22white%20legs%22&f=false) and believed to bear either a single white leg or a triskelion (https://archive.is/YoD4E).
It also occasionally appears on coins from Syracuse (https://www.cngcoins.com/Coin.aspx?CoinID=163516) though not, as far as I know, linked to shields.
Just found these
- https://www.academia.edu/3760013/The_Triskeles_on_Ancient_Greek_Coins
- https://www.academia.edu/27210981/Triskeles_on_Ancient_Coins
They find the device on coins of quite a few states, but mostly not as a shield-device. However there's one Athenian coin in the first paper, and a ceramic from Akragas/Agrigentum/Agrigento in the second, which may be shields.
Thanks all for the input.