If Frankincense Essential Oil is regarded as the King of Essential Oils, then, without doubt, Sacred Frankincense (Boswellia sacra) is the King of Frankincense Oils. The resin of the frankincense sacra tree has been used since ancient times, which was traded on the Incense Trade Route that flourished between the 7th century BCE and 2nd century BCE. Today, the pure essential oil from this resin is a rare and valued incense used in perfumery and aromatherapy.