lem·u·res /ˈlɛmyəˌriz; Lat. ˈlɛmʊˌrɛs/

–plural noun Roman Religion .
the ghosts of the dead of a family, considered as troublesome unless exorcised or propitiated; larvae.

1545–55; < L; see lemur

Source: Dictionary.com.

I realized I was having a vision and that there was a damned soul before me, one of the lemures.

Source: The Name of the Rose by Umberto Eco.