I have asked this question many times and no one has answered, This is about the 4th crusade, please summarize this! In 1198, Pope Innocent III called for a new Crusade, more out of a desire to elevate the papacy than in response to events in the Holy Land. This Crusade failed to rouse any monarchs. Led largely by French knights, the crusaders set out for the Holy Land in 1202 only to be distracted by Venetian lords who convinced them to capture the wealth and splendor of Eastern Orthodox Constantinople instead. So, rather than retake the Holy Land from Muslim rule, the Fourth Crusade sacked the capital of the Byzantine Empire, a Christian city. However, crusaders control of Constantinople lasted less than a century. The major accomplishment of this Crusade proved to be weakening the Byzantines enough that they could no longer hold off Muslim expansion.

The Fourth Crusade (1202–1204) was a Latin Christian armed expedition called by Pope Innocent III. The stated intent of the expedition was to recapture the Muslim-controlled city of Jerusalem, by first conquering the powerful Egyptian Ayyubid Sultanate, the strongest Muslim state of the time. However, a sequence of economic and political events culminated in the Crusader army's 1204 Sack of Constantinople, the capital of the Greek Christian-controlled Byzantine Empire, rather than Egypt as originally planned. In late 1202, financial issues led to the Crusader army conducting the Siege of Zara, sacking the Catholic city of Zara (Zadar) on the Adriatic Sea which was then brought under Venetian control. When the pope heard of this, he excommunicated the Crusader army. In January 1203, en route to Jerusalem, the Crusader leadership entered into an agreement with the Byzantine prince Alexios Angelos to divert the Crusade to Constantinople and restore his deposed father Isaac II Angelos as emperor. The intent of the Crusaders was then to continue to Jerusalem with promised Byzantine financial and military aid. On 23 June 1203, the main Crusader army reached Constantinople, while other contingents (perhaps a majority of all crusaders) continued to Acre.

In August 1203, following the Siege of Constantinople, Alexios was crowned co-emperor. However, in January 1204 he was deposed by a popular uprising. The Crusaders were no longer able to receive their promised payments from Alexios. Following the murder of Alexios on 8 February, the Crusaders decided on the outright conquest of the city. In April 1204, they captured and plundered the city's enormous wealth. Only a handful of the Crusaders continued to the Holy Land thereafter.

The conquest of Constantinople was followed by the fragmentation of the Byzantine Empire into three states centered in Nicaea, Trebizond and Epirus. The Crusaders then founded several new Crusader states, known as Frankokratia, in former Byzantine territory, largely hinged upon the Latin Empire of Constantinople. The presence of the Latin Crusader states almost immediately led to war with the Byzantine successor states and the Bulgarian Empire. The Nicaean Empire eventually recovered Constantinople and restored the Byzantine Empire in 1261.

The Fourth Crusade is considered to have solidified the East-West Schism. The crusade dealt an irrevocable blow to the Byzantine Empire, contributing to its decline.