What is the origin of the idiom "born in the purple" and when to use it?

The origin of the idiom "born in the purple" can be traced back to the Byzantine Empire, which existed from the 4th to the 15th centuries. In Byzantium, the color purple was associated with royalty and was exclusively reserved for the ruling emperor or empress. Purple dye was expensive and difficult to produce, making it a symbol of prestige and power. The phrase is often used in literature, academic writings, or cultural analyses to depict individuals who possess inherent advantages or entitlements due to their noble birth.