He was the son of Édouard de Carteret, Seigneur of Saint Ouen (d. 1533), and grandson of Philip de Carteret, 8th Seigneur of St Ouen.
[1] It was Helier's idea and initiative to re-cultivate the deserted island in 1563, and in 1565 he was rewarded by Queen Elizabeth I with Letters Patent granting him the fief.
She was the widow of Clement Dumaresq and daughter of the bailiff Helier de Carteret, the uncle and namesake to the Seigneur of Sark.
Hellier and Margaret's son was Philippe de Carteret I.
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