that Tolkien states (Appendix A I [i]) that there were three unions of the
Eldar (i.e. Elves) and the Edain (Men) -- and enumerates them: Lśthien & Beren;
Idril & Turgon; Arwen & Aragorn. If Imrahil is to have Elvish blood,
there had to be a fourth...
The Reverend's solution was to assume that Tolkien meant to
say "between High Elves and Edain" in Appendix A -- that would leave the door
open for other unions between Men and non-High
Elves.
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The Nazgūl never did find out who it had been who -- during their unsuccessful attack on Strider and the Hobbits at Weathertop -- had applied glue to their horses' saddles. Certainly the Nazgūl, upon attempting to dismount after a hard night's ride, had not considered the matter amusing.