seventh angel
The Seventh Angel is an alleged prophecy of a future personage to come to enlighten the world about the coming Christ, or in BUPC terminology the Davidic King. The BUPC assign this prophecy to a passage from Some Answered Questions, this passage was interpreted by early Baha'is to be a reference to Sayyid `Ali-Muhammad, al-Bab, as the 7th Angel, rather then a prophecy of a future personage to come after Baha'u'llah. Some Answered Questions was compiled from a series of talks then grouped by subject matter, so they can be hard to understand. In notes of early western Baha'is, such as Mason Remey, the connection of the Bab to the 7th angel is clear.
Passage from Some Answered Questions:
http://reference.bahai.org/en/t/ab/SAQ/saq-11.html.utf8?query=seventh%7Cangel&action=highlight#gr44