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In the novel The Sittaford Mystery, Captain Joseph Arthur Trevelyan was the owner of Sittaford House, and the tenant of Hazelmoor in Exhampton.

The Trevelyan family consists of his sister Mrs Jennifer Gardner and his nephews James Pearson and Brian Pearson and niece Sylvia Dering, children of his deceased sister Mary Pearson.

He was a sporting and hunting man, and was fond of crosswords and acrostics.

Mr Rycroft tells Emily Trefusis that the name Trevelyan is a Cornish name.