Blonde Girl Shows Off In The Purple Bed

Porpora, or purpure, was not one of the usual tinctures in European heraldry, being added at a late date to bring the number of colors plus metals to seven, so that they could be given planetary associations. The classic early example of purpure is in the coat of arms of the Kingdom of León: argent, a lion purpure, as early as 1245.
• History
Byzantine empresses gave birth in the Purple Chamber of the palace of the Byzantine Emperors. Therefore, being named Porphyrogenitus ("born to the purple") marked a dynastic emperor as opposed to a general who won the throne by his effort.
In China, the Chinese name of the Forbidden City literally means "purple forbidden city" 紫禁城 with first character 紫 meaning purple (even though the Chinese Emperor himself wore yellow, which was considered in China to be the imperial color).