The launch of the First Crusade in 1095 would result in new states in the medieval Middle East. Here are three videos on how the Crusader States developed from the 11th to 13th centuries.
The first video, by Warsaw HD Graphics, focuses on the Kingdom of Jerusalem, between the years 1099 and 1291:
EmperorTigerstar created this video showing the changes in borders among all the Crusader States, including the Principality of Antioch and the County of Edessa:
Finally, Ollie Bye has created a video showing the crusader territories and key moments between the years 1095 and 1229:
Top Image: MapMaster / Wikimedia Commons