What is the origin of the idiom "olive branch" and when to use it?

The origin of the idiom "olive branch" can be traced back to ancient Greek and Roman cultures. In both civilizations, the olive tree held great significance and was associated with peace, prosperity, and divine blessings. The practice of offering an olive branch as a symbol of peace dates back to the ancient Olympic Games, where victorious athletes were crowned with wreaths made of olive branches. It is commonly employed in interpersonal relationships, especially during times of disagreement or tension, to extend a gesture of goodwill and initiate dialogue for finding common ground.