  This paper gives a classification of all pairs $(\mathfrak g, \mathfrak h)$
with $\mathfrak g$ a simple real Lie algebra and $\mathfrak h < \mathfrak g$ a
reductive subalgebra for which there exists a minimal parabolic subalgebra
$\mathfrak p < \mathfrak g$ such that $\mathfrak g = \mathfrak h + \mathfrak p$
as vector sum.
