Rav Ena was a Jewish Savora

Savora

A Savora is a term used in Jewish law and history to signify one among the leading rabbis living from the end of period of the Amoraim to the beginning of the Geonim...

 sage of the second generation of the Savora

Savora

A Savora is a term used in Jewish law and history to signify one among the leading rabbis living from the end of period of the Amoraim to the beginning of the Geonim...

 era. He headed the Sura

Sura (city)

Sura was a city in the southern part of ancient Babylonia, located west of the Euphrates River. It was well-known for its agricultural produce, which included grapes, wheat, and barley...

 academy and was a counterpart of R. Simuna

Simuna

R. Simuna was a Jewish Savora sage of the second generation of the Savora era. He headed the Pumbedita Yeshiva parallelly to Rav Ena running the Sura academy, and both committed the Talmud to writing...

, head of the Yeshiva

Yeshiva

Yeshiva is a Jewish educational institution that focuses on the study of traditional religious texts, primarily the Talmud and Torah study. Study is usually done through daily shiurim and in study pairs called chavrutas...

 in Pumbedita

Pumbedita

Pumbedita was the name of a city in ancient Babylonia close to the modern-day city of Fallujah....

. According to the Iggeret Rav Sherira Gaon

Sherira Gaon

Rav Sherira Gaon was the head of the Academy of Pumbeditha. He was one of the most prominent Geonim of his period, and the father of Hai Gaon, who succeeded him as gaon.Sherira was born in 906 and died in 1006. Rav Sherira Gaon (Hebrew: רב שרירא גאון or R. Sherira ben Ḥanina Gaon, Hebrew: רב...

, R. Ena and R. Simuna added-on anonymous annotations to the Babylon

Babylon

Babylon was an Akkadian city-state of ancient Mesopotamia, the remains of which are found in present-day Al Hillah, Babil Province, Iraq, about 85 kilometers south of Baghdad...

ian Talmud

Talmud

The Talmud is a central text of mainstream Judaism. It takes the form of a record of rabbinic discussions pertaining to Jewish law, ethics, philosophy, customs and history....

, during the process of the Savora

Savora

A Savora is a term used in Jewish law and history to signify one among the leading rabbis living from the end of period of the Amoraim to the beginning of the Geonim...

 arrangement of the Talmud

Talmud

The Talmud is a central text of mainstream Judaism. It takes the form of a record of rabbinic discussions pertaining to Jewish law, ethics, philosophy, customs and history....

, that included adding additional clarification and Halkhaic rulings. Some scholars identify him with Rav Giza (רב גיזא). Died in year 540 AD (שנת ד'ש'; Hebrew calendar

Hebrew calendar

The Hebrew calendar , or Jewish calendar, is a lunisolar calendar used today predominantly for Jewish religious observances. It determines the dates for Jewish holidays and the appropriate public reading of Torah portions, yahrzeits , and daily Psalm reading, among many ceremonial uses...

).