By Alexandria pogroms modern scholars refer to the persecution of Jews in 38

38

Year 38 was a common year starting on Wednesday of the Julian calendar. At the time, it was known as the Year of the Consulship of Iulianus and Asprenas...

 AD in Roman Alexandria, Egypt. The sole source is Philo of Alexandria, himself a Jew, who witnessed the riots and afterwards led the Jewish delegation to the Roman emperor Caligula

Caligula

Caligula , also known as Gaius, was Roman Emperor from 37 AD to 41 AD. Caligula was a member of the house of rulers conventionally known as the Julio-Claudian dynasty. Caligula's father Germanicus, the nephew and adopted son of Emperor Tiberius, was a very successful general and one of Rome's most...

, that requested the reestablishment of legal Jewish residence in Alexandria.