Historically, Mount Bromo, formerly Mount Tengger. Small eruptions that occurred in Mount Bromo resulted in the emergence of a large caldera with a diameter of about 8 km. The depth of the caldera makes the volcanic material trapped inside. Well the result of this eruption also formed a tunnel of magma which then raises a row of other mounts include Mount Widodaren, Mount Watangan, Mount Chairs, Mount Batok and Mount Bromo. Mount Bromo itself into the Tengger region inhabited by indigenous tribes dubbed the Tribe
Tengger. The original inhabitants of the Bromo plain also turned out to have unique facts that many people do not know about. If we go through the stories that people believe, there is an active heir of the oral tradition of the Tenggerese. This person is referred to as Tengger Dukun. According to this Tengger Dukun, the so-called Tenggerese are descendants of the Majapahit refugees.
Uniquely, Tengger people consider Mount Bromo is a mountain that is considered as a Holy Mountain, especially by the Tengger Tribe. They think of Mount Bromo as Mount Brahma. Thus, this mountain was sanctified by the Tenggerese.
Every year in this mountain ceremony held Yadnya Kasada or Kasodo. Usually the ceremony is in a degree at a temple that is under the foot of Mount Bromo and continued to the top of Bromo. The ceremony is held from midnight to dawn every full moon around the 14th or 15th of the month of Kasodo (tenth) according to the Javanese calendar.