(ger)Der korrekte Name beinheltet kein "von", ier lautet lediglich "Adolph Freiherr Knigge".
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Adolph Freiherr Knigge is currently considered a "single author." If one or more works are by a distinct, homonymous authors, go ahead and split the author.
Adolph Freiherr Knigge is composed of 15 names. You can examine and separate out names.