The based loop space homology of a special family of homogeneous spaces, flag
manifolds of connected compact Lie groups is studied. First, the rational
homology of the based loop space on a complete flag manifold is calculated
together with its Pontrjagin structure. Second, it is shown that the integral
homology of the based loop space on a flag manifold is torsion free. This
results in a description of the integral homology. In addition, the integral
Pontrjagin structure is determined.Comment: revised version, 17 pages, to appear in Osaka Journal of Mathematic