He was the illegitimate son of Sir John St Aubyn, 5th Baronet, of Clowance, on whose death in 1839 the baronetcy of Clowance had become extinct (see St Aubyn Baronets).
Clowance House was the seat of the St Aubyns (from 1671 they were Baronets but the line ended with Sir John St Aubyn, 5th Baronet in 1839).
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