In 217 BC, Antiochus III and Ptolemy IV Philopator fought the Battle of Raphia, also known as the Battle of Gaza. Antiochus nearly won this battle, winning the cavalry duel but losing the infantry fight.
the night before the battle, Theodotus the Aetolian, formerly an officer of Ptolemy, sneaked inside the Ptolemaic camp and reached what he presumed to be the King's tent but Ptolemy was absent and so failed to assassinate him.
What if...
Theodotus assassinated Ptolemy?
Antiochus won the battle?