When was it made?
Since this seal was for the Latin Emperor Henry of Flanders, it was made during his reign from 1206 to 1216. Not too long before Henry began his reign as emperor, the Crusaders leading the Fourth Crusade (1202-1204) shifted their attention from attacking the Holy Land to conquering the Byzantine Empire, whose capital was in Constantinople. Constantinople is the city now known as Istanbul, in Turkey. Leading up to this conquest, the Byzantine Empire was already suffering with many problems, primarily the lack of control among their territories.
Emperor Henry of Flanders, the successor of his brother Baldwin, had successfully been one of the leaders in the Fourth Crusades. Not only had he shown his military expertise in war, but also honorable leadership qualities. During his reign over the newly founded Latin Empire of Constantinople, he continued to lead with these favorable qualities as he is attributed with a relatively fair treatment of the Greeks left from the former Byzantine Empire. He also maintained his strong military presence as he successfully expanded the Latin Empire through several combats until his death in 1216.