...His quiver rattled
as he found his feet and felt his bow,
hard horn-pointed, by hands of cunning
of black yew wrought; with bears' sinews
it was stoutly strung; strength to bend it
had nor Man nor Elf save the magic helped him
that Beleg the bowman now bore alone.

(HoME III, The Lays of Beleriand, Túrin Son of Húrin & Glorund the Dragon, 1070-1079)

Then Gwindor roused Túrin to aid him in the burial of Beleg, and he rose as one that walked in sleep; and together they laid Beleg in a shallow grave, and placed beside him Belthronding his great bow, that was made of black yew-wood.

(Silm, Chapter 21, Of Túrin Turambar)

Belthronding - The bow of Beleg Cuthalion, which was buried with him. 256

(Silm, Appendix)