Historical clue formulations

• Trident-wielding god of the sea — 2023-07-18
• God who banished 63-Across to the sky, as depicted by the constellation formed by the X's in this puzzle's finished grid — 2018-10-03
• Neptune's Greek counterpart — 2017-01-24
• Greek god of the ocean — 2012-07-30
• Ill-fated ship of film — 2010-10-27