One of the seven churches described in the book of Revelation.
"And unto the Angel of the Church in Thyatira write: These things saith the Son of God, who hath His eyes like unto a flame of fire, and His feet are like fine brass. I know thy works, and charity, and service, and faith, and thy patience, and thy works; and the last to be more than the first. Notwithstanding I have a few things against thee, because thou sufferest that woman JEZEBEL, which calleth herself a Prophetess, to teach and to seduce my servants to commit fornication, and to eat things sacrificed unto idols. And I gave her space to repent of her fornication: and she repented not. Behold, I will cast her into a bed, and them that commit adultery with her into great tribulation, except they repent of their deeds. And I will kill her children with death; and all the churches shall know that I am He which searcheth the reins and hearts: and I will give unto every one of you according to your works." But unto you I say, and unto the rest in Thyatira, as many as have not this doctrine, and which have not known the depths of Satan, as they speak; I will put upon you none other burden. But that which ye have already, hold fast till I come. And he that overcometh, and keepeth my works unto the end, to him will I give power over the nations: and he shall rule them with a rod of iron; as the vessels of a potter shall they be broken to shivers: even as I received of My Father. And I will give him the MORNING STAR. He that hath an ear, let him hear what the Spirit saith unto the Churches." - Rev. 2:18-29
"When the Kundalini reaches the heart it opens up the chakra of Thyatira. This grants us the power to work with the four winds. The lotus of the heart has twelve petals and its element is the air elemental of the wise. Whosoever wants to learn how to enter into the supra-sensible worlds with the physical body must awaken the chakra of the heart. This is what is known as “Jinn” science. Then, indeed, the human body can leave the physical plane and enter the supra-sensible worlds. When the sacred serpent reaches the heart it opens the church of Thyatira and transforms us into intuitive human beings." - Samael Aun Weor, The Yellow Book