He proclaimed the revolution at Areopoli on March 17 , 1821 .
Petros Mavromichalis , the last bey of Mani , was among the leaders of the Greek War of Independence .
Mani proclaimed the revolution at Areopoli on March 17 , 1821 .
Petros Mavromichalis , the last bey of Mani , was among the leaders of the Greek War of Independence .