Frederick William Trethowan
- Born: 1870, Bellarine, Victoria Australia
- Marriage (1): Alma Harriet Augusta Calhoun in 1900 in Portarlington, Victoria Australia
- Died: 1943, Melbourne, Victoria Australia at age 73
- Buried: 1943, Fawkner Cemetery, Hadfield, Melbourne, Victoria Australia
Frederick married Alma Harriet Augusta Calhoun in 1900 in Portarlington, Victoria Australia. (Alma Harriet Augusta Calhoun was born in 1874 in Portarlington, Victoria Australia and died in 1966 in Melbourne, Victoria Australia.)
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