Gelo
From LSJ
προγράψαντες οὖν τά τε θεωρήματα καὶ τὰ ἐπιτάγματα τὰ χρεῖαν ἔχοντα εἰς τὰς ἀποδείξιας αὐτῶν μετὰ ταῦτα γραψοῦμές τοι τὰ προκείμενα → having therefore written at the beginning the theorems and the postulates that are necessary for their proofs, we will then write out for you the propositions
Γέλων, -ωνος, ὁ.
Gĕlo: or Gĕlon, ōnis, m., = Γέλων,
I king of Syracuse, son of Hiero II., Liv. 23, 30; 24, 5; Just. 23, 4; Plin. 8, 40, 61, § 144.
(2) Gĕlō, ōnis, m., Gélon [tyran de Syracuse] : Liv. 23, 30.