Susis
Could not find Susidis in Logeion dictionaries.
Susidis Proper-name adjective: feminine genitive singular of Susis
Sūsis, ĭdis, v. Susa, C.
Sūsis, idis, f., s. Sūsa.
Sūsis, (16) ĭdis, adj. f. , de Suse : Sid. Ep. 7, 17 ; 8, 9 || Sūsĭdes pylæ Curt. 5, 3, 17, Portes de Suse (défilé).