Prima expeditio sacra
Prima expeditio sacra fuit bellum anno 1095 ab Urbano II Papa motum, qui Alexium I, imperatorem Imperii Byzantini, adiuvando speravit duas ecclesias apostolicas reconciliatum iri. Eadem expeditione etiam speravit Hierosolyma a Musulmanis liberatum iri, qui Antiochia capta ea anno 1071 expugnaverant.

Hierosolyma a Christianis die 15 Iulii 1099 capta est.

Fontes primae expeditionis sacrae 
 Gesta Francorum et aliorum Hierosolymitanorum
 Petrus Tudebodus, Historia de Hierosolymitano itinere
 Baldericus Dolensis, Historia Hierosolymitana
 Guibertus, Gesta Dei per Francos
 Robertus monachus, Historia Hierosolymitana
 Radulphus Cadomensis, Gesta Tancredi
 Canso d'Antioca (fons lacunosus) cum La gran conquista de Ultramar
 Chanson d'Antioche et Chanson de Jérusalem
 Gilo Parisiensis, Historia viae Hierosolymitanae
 Albertus Aquensis, Historia Hierosolymitanae expeditionis
 Fulcherius Carnotensis, Historia Hierosolymitana
 Bartolfus de Nangeio, Historia Francorum expugnantium Iherusalem

Gesta Francorum et aliorum Hierosolymitanorum

Bibliographia
 Generalia
 Steven Runciman, A History of the Crusades. 3 voll. Cantabrigiae: Cambridge University Press, 1951-1954
 

 Specialia
 H. E. J. Cowdrey, "Canon Law and the First Crusade" in B. Z. Kedar, ed., The Horns of Ḥaṭṭīn: proceedings of the second conference of the second conference of the Society for the Study of the Crusades and the Latin East, 1987 (Hierosolymis: Yad Izhak Ben-Zvi, 1992. ISBN 965-217-085-2) pp. 41-48
 John France, Victory in the East: a military history of the First Crusade. Cantabrigiae: Cambridge University Press, 1994. ISBN 0-521-41969-7 
 Norman Housley, "Jerusalem and the Development of the Crusade Idea, 1099-1128" in B. Z. Kedar, ed., The Horns of Ḥaṭṭīn: proceedings of the second conference of the Society for the Study of the Crusades and the Latin East, 1987 (Hierosolymis: Yad Izhak Ben-Zvi, 1992. ISBN 965-217-085-2) pp. 27-40
 J. S. C. Riley-Smith, "The First Crusade and St. Peter" in B. Z. Kedar, H. E. Mayer, R. C. Smail, edd., Outremer: Studies in the History of the Crusading Kingdom of Jerusalem presented to Joshua Prawer (Hierosolymis: Ben-Zvi Institute, 1982. ISBN 965-217-010-0) pp. 41-63

 Hugo de Paganis

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Urbanus II