http://www.cbc.ca/news/technology/shackled-skeletons-ancient-greece-1.3703346
The cemetery dates from between the 8th and 5th century BC.
"It is a period of great unrest for Athenian society, a period where aristocrats, nobles, are battling with each other
for power," said Chryssoulaki.
One of the strongest theories is that they were supporters of Cylon, an Athenian noble and Olympic champion who staged an attempted coup in Athens in 632 BC with the help of his father-in-law, the tyrant of Megara.