Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Săūl, ūlis, or indecl. m., the first king of the Jews, Alcim. ad Sor. 435; Paul. Nol. Carm. 13, 601; Vulg. 1 Reg. 9, 2; id. Act. 13, 21; gen. Saulis, id. Isa. 10, 29; dat. Sauli, id. Psa. 51, 1; acc. Saulem, id. 1 Reg. 15, 35.