Crusade on the 11th century Mediterranean Sea

"Long before pope Urban II made his ímpassioned plea at Clerrnont, the Italian cities were fighting the Saracens on land and sea. 

Co-habitation of church and state in early 11th century France

"At the beginning of the eleventh century France was the only feudal state in Europe. (...) Actually France was not a single state but an alliance of feudal principalities bound together by the feeble suzerainty of the king.