Fulcher was given his clerical education in Chartres and while his early overlord was Stephen of Blois, with whom he traveled to Constantinople during the First Crusade, he then became the chaplain to Baldwin of Flanders and followed him when he broke away from the main crusading army to take part in the founding of the crusader County of Edessa in 1097.
After the conquest of Jerusalem he then traveled to the holy city with Baldwin to complete his pilgrimage vow in 1099. When Baldwin became King of Jerusalem in 1100, Fulcher again moved with him to the city and may have continued to act as his personal chaplain until 1115, when he became canon of the Church of the Holy Sepulcher.
Fulcher began his chronicle sometime in in 1100 or 1101 in a version that has only survived because it was used as a source by the chronicler Guibert of Nogent. His three book chronicle began with the preparations that took place under Pope Urban II for the launching of the First Crusade and ended in 1127 during the reign of Baldwin II when Fulcher apparently died of plague.
His chronological account includes many interesting episodes, not least of which are Fulcher's version of Urban's speech, the capture of Jerusalm, and events that took place in the Holy Land following the crusade. Another aspect of the work that is noteworthy is the religious tone that Fulcher sets throughout the work. For example, during the ultimately successful, but problematic siege of Antioch, Fulcher notes that it was only after the crusader's acknowledged their sins and repented, that God allowed the complete conquest of the city.
Also of interest is his depiction of the crusaders essentially "going native" in the Holy Land. He noted:
We who have been occidentals, have become orientals; a man once Italian
of French has here become Galilean or Palestinian: and the man who once
lived in Reims or Chartres now finds he is a citizen of Tyre or Acre. We
have already forgotten the places of our birth...Some have married women
who are Syrian or Armenian perhaps, or even saracens who have received
the grace of baptism. He who was once a stranger here is now a native...
From the University of Michigan-Selection of Fulcher of Chartres on Orientalized Greeks.
The full text , in Latin with a French introduction, is available in the Recueil des Historiens des Croisades, Historiens Occidentaux, online at the Bibliotheque Nationale de France's Gallica Project.