How many years separated the first and the fourth crusades?

He first Crusade was in the period (1096-1099) and the Fourth Crusade was in the period (1202-1204)   

(1202-1099)103 years separated the First and the Fourth Crusades

The crusades were a military campaigns with the specific objective of restoring christian control of the Holy Land , were fought over a period of almost 200 years.

Communicating with the dead was common, it wasn’t seen as bizarre or weird,” explains murch. “it’s hard to imagine that now, we look at that and think, ‘why are you opening the gates of hell? ’