However , Antiochus III lost the battle .
Some time before the war of her father against the Romans she married king Ariarathes IV of Cappadocia , who therefore supported his father - in - law in the battle of Magnesia ( 190 BC ) .
Antiochus III lost the battle .
Some time before the war of her father against the Romans she married king Ariarathes IV of Cappadocia , who therefore supported his father - in - law in the battle of Magnesia ( 190 BC ) .