Dates: Time of the Trees
Turgon, 3rd High King of the Noldor in Beleriand
Children: Idril Celebrindal
[They] endured... the terror of the Helcaraxë and the cruel hills of ice.... There Elenwë the wife of Turgon was lost, and many others perished also; and it was with a lessened host that Fingolfin set foot at last upon the Outer Lands.
The Silmarillion, Quenta Silmarillion, Ch 9, Of the Flight of the Noldor
Turgon... had no heir; for Elenwë his wife perished in the crossing of the Helcaraxë, and his daughter Idril Celebrindal was his only child.
The Silmarillion, Quenta Silmarillion, Ch 16, Of Maeglin
Turgon's wife was lost and he had then only one daughter and no other heir. Turgon was nearly lost himself in attempts to rescue his wife — and he had less love for the Sons of Fëanor than any other.
Morgoth's Ring, HoME Vol 10, Part 2, The Annals of Aman
[Fingolfin's] daughter and third child... was under the protection of Turukáno who loved her dearly, and of Elenwë his wife.
The Peoples of Middle-earth, HoME Vol 12, Part 2, Ch 11, The Shibboleth of Fëanor: The Names of Finwë's Descendants
Elena Tiriel 17Oct07