  The reduction of higher dimensional supergravities to low dimensional dilaton
gravity theories is outlined. Then a recently proposed new class of integrable
theories of 0+1 and 1+1 dimensional dilaton gravity coupled to any number of
scalar fields is described in more detail. These models are reducible to
systems of independent Liouville equations whose solutions are not independent
because they must satisfy the energy and momentum constraints. The constraints
are solved, thus giving the explicit analytic solution of the theory in terms
of arbitrary chiral fields. In particular, these integrable theories describe
spherically symmetric black holes and branes of higher dimensional supergravity
theories as well as superstring motivated cosmological models.
