A Byzantine fleet sacks and destroys undefended Damietta in Egypt.

The Sack of Damietta was a successful raid on the port city of Damietta on the Nile Delta by the Byzantine navy on 22–24 May 853. The city, whose garrison was absent at the time, was sacked and plundered, yielding not only many captives but also large quantities of weapons and supplies intended for the Arab Emirate of Crete. The Byzantine attack, which was repeated in the subsequent years, shocked the Abbasid authorities, and urgent measures were taken to refortify the coasts and strengthen the local fleet, beginning a revival of the Egyptian navy that culminated in the Tulunid and Fatimid periods.

Damietta is a port city and the capital of the Damietta Governorate in Egypt. It is located at the Damietta branch, an eastern distributary of the Nile Delta, 15 kilometres (9.3 mi) from the Mediterranean Sea, and about 200 kilometres (120 mi) north of Cairo. It was a Catholic bishopric and is a multiple titular see. It is also a member of the UNESCO Global Network of Learning Cities.

Egypt, officially the Arab Republic of Egypt, is a country spanning the northeast corner of Africa and southwest corner of Asia via the Sinai Peninsula. It is bordered by the Mediterranean Sea to the north, the Gaza Strip of Palestine and Israel to the northeast, the Red Sea to the east, Sudan to the south, and Libya to the west; the Gulf of Aqaba in the northeast separates Egypt from Jordan and Saudi Arabia. Cairo is the capital, largest city, and leading cultural center, while Alexandria is the second-largest city and an important hub of industry and tourism. With over 107 million inhabitants, Egypt is the third-most populous country in Africa and 15th-most populated in the world.

May 22 is the 142nd day of the year in the Gregorian calendar; 223 days remain until the end of the year.