Sinis, two characters in Grecian mythology.
1. The son of Polypemon, Pemon, or Poseidon, by Sylea, who was surnamed Pityocampes (fir bender), or Procrustes. He dwelt on the isthmus of Corinth as a robber, and destroyed the travelers who fell into his power by fastening them to the tops of two fir trees which he had bent down, and which he then permitted to spring back to their upright condition. He was himself killed by Theseus in the same manner.
2. A son of Neptune and Anaxo, and brother to Cercyon. His mother dwelt in Troezen. Theseus murdered her sons and deflowered her daughters, in accordance with the custom of victors at that day.