Rav Hiyya bar Ami(Hebrew: חייא בר אמי) was a third- and fourth-generation Babylonian Amora.
His main teacher was Ulla,[1] but he also learned from Rav Chisda and Ḥulfana[2] Seder HaDoroth questions whether his father was a Kohen or not.
[5] The Talmud says that Rav Hiyya bar Ami's slave once immersed a gentile woman in a mikveh so he could have relations with her (to purify her from her niddah status).
The Talmud discusses the status of the woman and her daughter, whether immersion for the sake of niddah is also effective for conversion to Judaism.
Most of Rav Hiyya bar Ami's statements are said in the name of Ulla and are in the realm of halacha.