orus , ▁Poly ph ron , ▁Alexander , ▁T isi phon us , ▁and ▁Ly cop hr on ; ▁until , ▁at ▁length , ▁the ▁old ▁arist ocrat ical ▁families ▁called ▁in ▁the ▁assistance ▁of ▁Philip ▁II ▁of ▁Mac ed on , ▁who ▁dep riv ed ▁Ly cop hr on ▁of ▁his ▁power ▁in ▁ 3 5 3 ▁BC , ▁and ▁restored ▁the ▁ancient ▁government ▁in ▁the ▁different ▁towns . ▁At ▁Ph era e , ▁he ▁is ▁said ▁to ▁have ▁restored ▁popular , ▁or ▁at ▁least ▁republic an , ▁government .( D iod . ▁x vi . ▁ 3 8 .) ▁The ▁Th ess al ian ▁people ▁elected ▁Philip ▁arch on ▁tag us ▁of ▁the ▁Th ess al ian ▁League ▁for ▁life ; ▁a ▁few ▁years ▁later ▁( 3 4 4 ▁BC ), ▁he ▁re - est ab lished ▁the ▁t etr arch ies ▁( or ▁t et rad arch ie ), ▁installing ▁govern ors ▁devoted ▁to ▁his ▁interests ▁and ▁who ▁were ▁probably ▁members ▁of ▁the ▁ancient ▁noble ▁families . ▁( D em ost hen . ▁Philip , ▁ii . ▁p . ▁ 7 1 , ▁i ii . ▁p . ▁ 1 1 7 ; ▁Har p ocrat . ▁s . ▁v .). ▁The ▁Th ess al ian ▁caval ry ▁became ▁also ▁part ▁of ▁the ▁Mac ed onian ▁army ▁and ▁many ▁Th ess ali ans ▁took ▁part ▁in ▁the ▁campaign ▁of ▁Alexander ▁the ▁Great . ▁At ▁the ▁close ▁of ▁the ▁First ▁Mac ed onian ▁War , ▁ 1 9 7 ▁BC ,