Ancilla to the Pre-Socratic Philosophers: 56. Sîmus of Poseidônia; Myônides and Euphranôr 56. SÎMUS OF POSEIDÔNIA; MYÔNIDES AND EUPHRANÔR Sîmus of Poseidônia: fourth century. Myônides and Euphranôr. Pythagoreans. No writings are known. Simus was accused of publishing certain Pythagorean discoveries as his own.