Member of the House of Keys and one of the three who settled the terms of the Act of Settlement with the tenth Earl of Derby.

The Christians of Lewaigue in Maughold descend from Robert, second son of the William Christian who was Deemster alongside his father and succeeded to the Ronaldsway estate in 1535. They are therefore a branch distinct from the Christians of Milntown, and that distinction matters for reading the record, because the two houses used the same forenames.

His known part in Manx affairs is the settlement of the tenures. The ninth Earl had tried and failed to come to terms with the tenants over their holdings. Nothing was done until 1704, when a bargain made between James, the tenth Earl, and Bishop Wilson, with three members of the Keys, was agreed to by the Tynwald Court. The three were Ewan Christian of Milntown, Ewan Christian of Lewaigue, and John Stevenson of Balladoole. The Act which confirmed that agreement is the Act of Settlement, and it secured the tenants in their farms in perpetuity on fixed terms.

A tradition collected in the twentieth century attaches to the name rather than to a dated event. An extremely violent and obstinate spirit at Dreem-y-Jeeskaig had defeated everyone who tried to lay it, until Ewan Christian, known simply as Christian Lewaigue, was called in. The first time he addressed it, it told him to come again on a certain night, alone. He went the second time as asked, and it was not seen afterwards.