He was born in Moscow in Polish family. He was living in Warsaw since 1921. In 1937 he graduated in history at Warsaw University.
Gieysztor is the namesake of the Aleksander Gieysztor Prize of the Kronenberg Foundation and the Aleksander Gieysztor Academy of Humanities.
- 1994:Order of the White Eagle
- 1993: Commander's Cross with Star of the Order of Polonia Restituta
- Ze studiów nad genezą wypraw krzyżowych (1948)
- Zarys nauk pomocniczych historii (1948), a textbook
- Mitologia Słowian (1982)
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