Namesakes
Eustace
(a.k.a. Eustachius) (m) ?-118 
Saints
Josef I
(a.k.a. Eustachius) (m) 1678-1711
Bohemian Kings 1705-1711
Austrian Dukes and Emperors (Joseph I) 1705-1711
German Kings and Holy Roman Emperors (Joseph I) 1690-1711
Hungarian Kings and Queens (József I) 1687-1711