Sir Titus Salt was not knighted, but was a Baronet. A Baronet addressed as "Sir" similar to a knight but they rank above knights. Sir Salt was made a Baronet in 1869.
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The Governor General of the Province of Canada in 1860 was Sir Edmund Walker Head, 8th Baronet.
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Not necessarily; you might be a Baronet and have inherited your
title. Incidentally, when stating the name of a Knight (or
Baronet), place NO emphasis on the 'Sir', which is pronounced
'suh'. Sir Charles, for example, sounds like S'Charles.