Second Crusade 1147–1149

After a period of relative peace in which Christians and Muslims co-existed in the Holy Land, Muslims conquered the town of Edessa. A new crusade was called for by various preachers, most notably by Bernard of Clairvaux. French and South German armies, under the Kings Louis VII and Conrad III respectively, marched to Jerusalem in 1147 but failed to win any major victories, launching a failed pre-emptive siege of Damascus, an independent city that would soon fall into the hands of Nur ad-Din, the main enemy of the Crusaders. On the other side of the Mediterranean, however, the Second Crusade met with great success as a group of Northern European Crusaders stopped in Portugal, allied with the Portuguese King, Afonso I of Portugal, and retook Lisbon from the Muslims in 1147. A detachment from this group of crusaders helped Count Raymond Berenguer IV of Barcelona conquer the city of Tortosa the following year. In the Holy Land by 1150, both the kings of France and Germany had returned to their countries without any result. St. Bernard of Clairvaux, who in his preachings had encouraged the Second Crusade, was upset with the amount of misdirected violence and slaughter of the Jewish population of the Rhineland. North Germans and Danes attacked the Wends during the 1147 Wendish Crusade, which was unsuccessful as well.

Third Crusade 1187–1192

In 1187, Saladin, Sultan of Egypt, recaptured Jerusalem, following the Battle of Hattin. After taking Jerusalem back from the Christians, the Muslims spared civilians and for the most part left churches and shrines untouched to be able to collect ransom money from the Franks. Saladin is remembered respectfully in both European and Islamic sources as a man who "always stuck to his promise and was loyal." The reports of Saladin's victories shocked Europe. Pope Gregory VIII called for a crusade, which was led by several of Europe's most important leaders: Philip II of France, Richard I of England (aka Richard the Lionheart), and Frederick I, Holy Roman Emperor. Frederick drowned in Cilicia in 1190, leaving an unstable alliance between the English and the French. Before his arrival in the Holy Land Richard captured the island of Cyprus from the Byzantines in 1191. Cyprus would serve as a Crusader base for centuries to come, and would remain in Western European hands until the Ottoman Empire conquered the island from Venice in 1571. After a long siege, Richard the Lionheart recaptured the city of Acre and took the entire muslim garrison under captivity, which was executed after a series of failed negotiations. Philip left, in 1191, after the Crusaders had recaptured Acre from the Muslims. The Crusader army headed south along the coast of the Mediterranean Sea. They defeated the Muslims near Arsuf, recaptured the port city of Jaffa, and were in sight of Jerusalem. However, Richard did not believe he would be able to hold Jerusalem once it was captured, as the majority of Crusaders would then return to Europe, and the crusade ended without the taking of Jerusalem. Richard left the following year after negotiating a treaty with Saladin. The treaty allowed unarmed Christian pilgrims to make pilgrimages to the Holy Land (Jerusalem), while it remained under Muslim control.

On Richard's way home, his ship was wrecked and he ended up in Austria, where his enemy, Duke Leopold, captured him. The Duke delivered Richard to the Emperor Henry VI, who held the King for ransom. By 1197, Henry felt ready for a crusade, but he died in the same year of malaria. Richard I died during fighting in Europe and never returned to the Holy Land. The Third Crusade is sometimes referred to as the Kings' Crusade.

Fourth Crusade 1202–1204

The Fourth Crusade was initiated in 1202 by Pope Innocent III, with the intention of invading the Holy Land through Egypt. Because the Crusaders lacked the funds to pay for the fleet and provisions that they had contracted from the Venetians, Doge Enrico Dandolo enlisted the crusaders to restore the Christian city of Zara (Zadar) to obedience. Because they subsequently lacked provisions and time on their vessel lease, the leaders decided to go to Constantinople, where they attempted to place a Byzantine exile on the throne. After a series of misunderstandings and outbreaks of violence, the Crusaders sacked the city in 1204, and established the so-called Latin Empire and a series of other Crusader states throughout the territories of the Greek Byzantine Empire. This is often seen as the final breaking point of the Great Schism between the Eastern Orthodox Church and (Western) Roman Catholic Church.

Albigensian Crusade

The Albigensian Crusade was launched in 1209 to eliminate the heretical Cathars of Occitania (the south of modern-day France). It was a decade-long struggle that had as much to do with the concerns of northern France to extend its control southwards as it did with heresy. In the end, both the Cathars and the independence of southern France were exterminated.

Children's Crusade

The Children's Crusade is a series of possibly fictitious or misinterpreted events of 1212. The story is that an outburst of the old popular enthusiasm led a gathering of children in France and Germany, which Pope Innocent III interpreted as a reproof from heaven to their unworthy elders. The leader of the French army, Stephen, led 30,000 children. The leader of the German army, Nicholas, led 7,000 children. None of the children actually reached the Holy Land: those who did not return home or settle along the route to Jerusalem either died from shipwreck or hunger, or were sold into slavery in Egypt or North Africa.

Fifth Crusade 1217–1221

By processions, prayers, and preaching, the Church attempted to set another crusade afoot, and the Fourth Council of the Lateran (1215) formulated a plan for the recovery of the Holy Land. In the first phase, a crusading force from Austria and Hungary joined the forces of the king of Jerusalem and the prince of Antioch to take back Jerusalem. In the second phase, crusader forces achieved a remarkable feat in the capture of Damietta in Egypt in 1219, but under the urgent insistence of the papal legate, Pelagius, they then launched a foolhardy attack on Cairo in July of 1221. The crusaders were turned back after their dwindling supplies led to a forced retreat. A night-time attack by the ruler of Egypt, the powerful Sultan Al-Kamil, resulted in a great number of crusader losses and eventually in the surrender of the army. Al-Kamil agreed to an eight-year peace agreement with Europe.

Sixth Crusade 1228–1229

Emperor Frederick II had repeatedly vowed a crusade but failed to live up to his words, for which he was excommunicated by Pope Gregory IX in 1228. He nonetheless set sail from Brindisi, landed in Palestine, and through diplomacy he achieved unexpected success: Jerusalem, Nazareth, and Bethlehem were delivered to the crusaders for a period of ten years.

In 1229 after failing to conquer Egypt, Frederick II of the Holy Roman Empire, made a peace treaty with Al-Kamil, the ruler of Egypt. This treaty allowed Christians to rule over most of Jerusalem, while the Muslims were given control of the Dome of the Rock and the Al-Aksa mosque. The peace brought about by this treaty lasted for about ten years. Many of the Muslims though were not happy with Al-Kamil for giving up control of Jerusalem and in 1244, following a siege, the Muslims regained control of the city.

Seventh Crusade 1248–1254

The papal interests represented by the Templars brought on a conflict with Egypt in 1243, and in the following year a Khwarezmian force summoned by the latter stormed Jerusalem. The crusaders were drawn into battle at La Forbie in Gaza. The crusader army and its Bedouin mercenaries were completely defeated within forty-eight hours by Baibars' force of Khwarezmian tribesmen. This battle is considered by many historians to have been the death knell to the Kingdom of Outremer. Although this provoked no widespread outrage in Europe as the fall of Jerusalem in 1187 had done, Louis IX of France organized a crusade against Egypt from 1248 to 1254, leaving from the newly constructed port of Aigues-Mortes in southern France. It was a failure, and Louis spent much of the crusade living at the court of the crusader kingdom in Acre. In the midst of this crusade was the first Shepherds' Crusade in 1251.

Eighth Crusade 1270

The eighth Crusade was organized by Louis IX in 1270, again sailing from Aigues-Mortes, initially to come to the aid of the remnants of the crusader states in Syria. However, the crusade was diverted to Tunis, where Louis spent only two months before dying. For his efforts, Louis was later canonised. The Eighth Crusade is sometimes counted as the Seventh, if the Fifth and Sixth Crusades are counted as a single crusade. The Ninth Crusade is sometimes also counted as part of the Eighth.

Ninth (and Last) Crusade 1271–1272

The future Edward I of England undertook another expedition against Baibars in 1271, after having accompanied Louis on the Eighth Crusade. Louis died in Tunisia. The Ninth Crusade was deemed a failure and ended the Crusades in the Middle East.

In their later years, faced with the threat of the Egyptian Mamluks, the Crusaders' hopes rested with a Franco-Mongol alliance. The Ilkhanate's Mongols were thought to be sympathetic to Christianity, and the Frankish princes were most effective in gathering their help, engineering their invasions of the Middle East on several occasions.[citation needed] Although the Mongols successfully attacked as far south as Damascus on these campaigns, the ability to effectively coordinate with Crusades from the west was repeatedly frustrated most notably at the Battle of Ain Jalut in 1260. The Mamluks, led by Baibars, eventually made good their pledge to cleanse the entire Middle East of the Franks. With the fall of Antioch (1268), Tripoli (1289), and Acre (1291), those Christians unable to leave the cities were massacred or enslaved and the last traces of Christian rule in the Levant disappeared.