palladium
n. countablen. something that provides protection or safety for a group of people. In old stories, it was often a statue that kept a city safe from enemies.
n. a safeguard or source of protection; historically, an image or statue of the goddess Pallas Athena on which the safety of a city was believed to depend.
The free press is often called the palladium of liberty.
Ancient Troy was believed to be invincible as long as the sacred palladium remained within its city walls.
Legal scholars argue that the right to a fair trial serves as the ultimate palladium of a democratic society, shielding the individual from the arbitrary exercise of state power.
Often used metaphorically in formal or literary contexts to describe abstract concepts like 'liberty' or 'justice'.