Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
rŏgātus, ūs, m. [rogo], a request, suit, entreaty (Ciceron.; only in abl. sing.): Chilius te rogat et ego ejus rogatu, Cic. Att. 1, 9, 3; id. Lael. 1, 4; id. Fam. 7, 1, 4; 13, 36, 1.