wessentwegen

Etymology
+ -t- +

Adverb

 * 1)  because of whom

Usage notes
Formal standard German generally requires the genitive case with, but the dative case must be used whenever an adequate genitive form does not exist. Since wessentwegen now has an old-fashioned and possibly pedantic ring to it, the dative construction wegen is acceptable in formal writing. One might, however, prefer to rephrase a particular sentence so as to avoid both.