The when, where and who (of crusading) (article) | Khan Academy
https://www.khanacademy.org/humanities/medieval-world/x4b0eb531:the-crusades/x4b0eb531:a-beginner-s-guide-to-the-crusades/a/the-when-where-and-who-of-crusading
webMap of Crusader Jerusalem, Deeds of the Franks who attacked Jerusalem (Gesta Francorum Hierusalem expugnatium), Saint-Bertin, France, late 12th century, with scene of two military saints, Sts. Demetrios and George, vanquishing an unidentified enemy (Koninklijke Bibliotheek, The Hague; photo: Geagea, public domain)
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