This is the fourth selection of Jean Richard s articles to be published by Variorum like them it brings together much widely scattered material The first selection focuses on the crusading process the conception and execution of a crusade the motivation of its participants The following one looks at the establishment of the crusaders in the East in the 12th 13th centuries with particular studies on the social composition of their states and the setting up of a Latin Church in the Empire of Constantinople The final articles deal with the period after the fall of Acre with the attempted trade embargo of Egypt and the administrative structures of the kingdoms of Cyprus and Armenia and their diplomatic Ceci est la quatrieme selection d articles de Jean Richard que publie Variorum ainsi que celles auxquelles elle vient s ajouter elle rassemble quantite de materiaux demeures jusqu alors tres eparpilles La premiere partie se concentre sur le processus de la croisade sa conception son execution et la motivation de ceux amenes A y participer La partie suivante A l aide d etudes specifiques quant A la composition de leurs etats respectifs ou A la mise en place d une Eglise latine dans l empire de Constantinople se rattache A l installation des croises en Orient aux 12e et 13e siecles Les derniers articles traitent de la periode qui a suivi la chute d Acre avec la tentative d embargo commercial de l Egypte et les structures administratives des royaumes de Chypre et d Armenie et leur diplomatique