πεντηκοντήρ
From LSJ
ἅπαντι δαίμων ἀνδρὶ συμπαρίσταται εὐθὺς γενομένῳ μυσταγωγὸς τοῦ βίου → a spirit assists every man from birth to be the leader of his life
English (LSJ)
ῆρος, ὁ,
A commander of fifty men, name of an officer in the Spartan army, Th.5.66, X. An. 3.4.21 :—written πεντηκοστήρ in Id.Lac. 11.4, 13.4, HG 3.5.22, 4.5.7.