Megapenthes of Sparta Megapenthes of Sparta In Greek mythology, Megapenthes (; Ancient Greek: Μεγαπένθης "Megapénthēs"), a Spartan prince and son of Menelaus, who ruled after his father's death and sent his mother (or step-mother) Helen into exile. In some legends, Helen was his mother; in most, however, he was Menelaus's son by a concubine, Pieris or Tereis, and was born during the Trojan War. His name means "great sorrow" and he is named that because he was conceived while Menelaus was grieving the loss of Helen. He marries the daughter of Alector in the beginning of Book IV of The Odyssey, whose name
Menelaus of Alexandria great circle arcs, which he named "trilaterals") and proves Menelaus' theorem on collinearity of points on the edges of a triangle (which may have been previously known) and its analog for spherical triangles. It was later translated by the sixteenth century astronomer and mathematician Francesco Maurolico. The lunar crater Menelaus is named after him. The titles of a few books by Menelaus have been preserved: Menelaus of Alexandria Menelaus of Alexandria (; , "Menelaos ho Alexandreus"; c. 70 – 140 CE) was a Greek mathematician and astronomer, the first to recognize geodesics on a curved surface as natural analogs of