  We propose a scenario for realizing super-Planckian axion decay constants in
Calabi-Yau orientifolds of type IIB string theory, leading to large-field
inflation. Our construction is a simple embedding in string theory of the
mechanism of Kim, Nilles, and Peloso, in which a large effective decay constant
arises from alignment of two smaller decay constants. The key ingredient is
gaugino condensation on magnetized or multiply-wound D7-branes. We argue that,
under very mild assumptions about the topology of the Calabi-Yau, there are
controllable points in moduli space with large effective decay constants.
