Who were the main participants and what was the primary reason for the first crusade?

The reason for the first crusade was to free the "Holy Land" from musIim command and I believe the main participants were from France.

The main participants - the First Crusade were formed by many belligerent kingdoms. I believe that we can separate them into the Papal States, the Kingdom of France, the County of Flanders, and the Holy Roman Empire.

The primary reason - it was to free the Holy Land (Jerusalem), however, there were political and economical reasons behind this Pope decision.

Explanation:

The Kingdom of Jerusalem is the place where three faiths converge: Christianity, Judaism, and Islam. One of the Islamic precepts was jihad (striving), and according to the Islamic faith, Jerusalem should be conquested.  In the 10th century, the Turks take control of the Holy Land, avoiding the pilgrim access to that place. In March 1095, the emperor of Constantinople asks for help, arguing that the pilgrims were suffering to reach Jerusalem. Pope Urban II decides to help and sends soldiers to retake the Holy Land. However, there were more than just faith and love for Christianity. To the Church, it was a great opportunity to create good relations with the Bizantine Orthodox Church, after the East-West Schism in 1054, when the Christian Church divided itself into two main powers, each one ruling a part of the world.

answer: they’re different

explanation: different people

gaius cassius longinus and marcus junius brutus, former enemies of julius caesar who'd joined the roman senate, led caesar's assassination, dubbing themselves "the liberators." and the second one is   the assassination of julius caesar was the result of a conspiracy by many roman senators led by gaius cassius longinus, decimus junius brutus albinus, and marcus junius brutus. they stabbed caesar (23 times) to death in a location adjacent to the theatre of pompey on the ides of march 15 march 44 bc.