Background
Costakis was born in Pera Melana in Arcadia, a Tsakonian-speaking village.
Costakis was born in Pera Melana in Arcadia, a Tsakonian-speaking village.
He taught at several high schools in Athens before taking a post at the Academy of Athens, serving as a contributor to the Historical Lexicon. In addition to his linguistic works, he also published a volume on the traditional architecture of Tsakonia.