Otto von Bismarck died on July 30, 1898 at the age of 83.
Christian Archibald Herter - physician - died on 1910-12-05.
Christian Otto Mohr died in 1918.
Otto Christian Hammer died on 1892-03-10.
Given that he was 83, I think it's fairly safe to say "natural causes."
Archibald Bulloch died in 1777.
Archibald Roosevelt died in 1979.
Archibald Colquhoun died in 1820.
Archibald MacMechan died in 1933.
Archibald Pinnell died in 1904.
Archibald Constable died in 1827.
Archibald Austin died in 1837.