Otto von ___, statesman nicknamed 'The Iron Chancellor (8)

I believe the answer is:

bismarck

(Other definitions for bismarck that I've seen before include "The Iron Chancellor" , "Otto von ... Prussian statesman" , "Otto von -, nineteenth century German politician" , "Uniter of Germany" , "We sank it, May 1941" .)

I've seen this clue in The Independent.

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