Henry Treffry Dunn, Dante Gabriel Rossetti's assistant and painter in his own right
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Henry Donn (otherwise Henry Dunn), one of the conspirators involved in the Babington Plot
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Interestingly, at that very same time O'Halloran's younger brother, Captain (later Major General) Henry Dunn O'Halloran (1800-71), 69th Regt., posted at New Brunswick, Canada, was conducting a significant study of the language and customs of the indigenous Mi'kmaq people.