Lewis & Short

Prōtĕsĭlāus, i, m., = Πρωτεσίλαος,

  1. I. a son of Iphiclus, a native of Phylace in Thessaly, the husband of Laodamia, and the leader of the Thessalians against Troy, where he was the first man killed, Ov. M. 12, 68; Prop. 1, 19, 7; Mel. 2, 2; Hyg. Fab. 103 sq.
    Hence,
  2. II. Prōtĕsĭlāēus, a, um, adj., Protesilœan: domus, Cat. 68, 74.