A city in Egypt near the delta of the Nile with a population of a million in the 1st cent. CE, including a large Jewish area. Philo is the best-known Jewish scholar of the city. It is not known who established a Christian Church in the city (a legend attributes it to Mark) but Acts 18: 24 mentions that it had been the birthplace of Apollos. Possibly the letter to the Hebrews was written from Alexandria; there are similarities in outlook and attitude to Philo.