Tiburtinus
Could not find Tiburtini in Logeion dictionaries.
Tiburtini Proper-name adjective: masculine vocative plural, Proper-name adjective: neuter genitive singular, Proper-name adjective: masculine nominative plural, Proper-name adjective: masculine genitive singular of Tiburtinus
Tīburtīnus, (14) a, um, de Tibur : Plin. 15, 70 ; Prop. 4, 7, 85 ; Mart. 4, 57, 10 || Tīburtīnum, ī, n. , maison de campagne de Tibur : Cic. Phil. 5, 19 ; Sen. Ben. 4, 12, 4.