Hugo Dyson, whose full name was Henry Victor Dyson Dyson, was a member of the Inklings literary group. He was a strong Christian, and together with J.R.R Tolkien, he helped to lead C.S. Lewis to Christ.
Lewis described him to Arthur Greeves as one of his friends of the second class, on a the level with his friendship with J.R.R. Tolkien (TST, 372, 421).
Lewis expressed his appreciation for Dyson's help in the preface of The Allegory of Love, and dedicated Rehabilitations to him.