Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Spōlētĭum (afterwards called also Spōlētum; cf. Prisc. p. 592 P.; but whether so as early as the class. period is doubtful, owing to the uncertainty of the readings in the MSS. of Livy, Suetonius, and Florus; cf. Duk. ad Flor. 3, 21, 27), ii, n., a city of Umbria, now Spoleto, Liv. 22, 9; 24, 10; 45, 43; id. Epit. 20; Vell. 1, 14 fin.; Flor. 3, 21, 27; Suet. Vesp. 1; id. Gram. 21; Aur. Vict. Ep. 31.
Hence,