(usu + to) to belong or be connected as a rightful or customary part, possession, or attribute; to pertain
We were then ordered to give up all nautical instruments and letters appertaining to any of us — R H Dana
In this great stretch of country there is no sign of life nor of anything appertaining to life — Conan Doyle
[Middle English apperteinen via Old French apartenir from late Latin appertinēre, from Latin ap-1 + pertinēre to belong, pertain]