Abstract
The formation and evolution of massive binary black holes in galactic nuclei is discussed in a galaxy merger model for the activation of galactic nuclei. Mass flow into a galactic nucleus induced by the merger causes the simultaneous tightening of a preexisting binary and an increase in the fueling level of the central hole(s). The model predicts that during the final, short and most luminous phase of an AGN the precession period of the central hole will rapidly become as short as 103 yr. Some observational implications are mentioned.
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