Ulla or 'Ulla was a Jewish Talmudist and one of the leading Halakhic amoraim in the Land of Israel during the late 3rd and early 4th centuries CE (the second and third amoraic generations).
[2] He was greatly respected for his learning; and during his visits to Babylonia he seems to have been invited frequently by the Resh Galuta to deliver halakhic lectures.
[3] He traveled repeatedly to the Talmudic Academies in Babylonia; and on one of his journeys he was in danger of assassination by one of his companions, saving his life only by condoning the murder of another.
[4] Ulla rendered important decisions regarding the benedictions and the calculation of the new moon, and was accustomed to promulgate his rulings in Babylonia when he went there.
[6] On one occasion, when he heard R. Huna use an expression which he did not approve, he retorted, "As vinegar to the teeth, and as smoke to eyes,[7] so are the words of R.