What does the name Cairo mean?

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Cairo is known in Arabic as Al-Qāhirah, meaning “The Victorious.” When the Fatimids invaded Egypt (969 CE), a new city was established to the northeast of existing settlements. This city was called Al-Qāhirah in celebration of the arrival of the Fatimid caliph al-Muʿizz, who made the city the capital of a dynasty that lasted two centuries.