Who became the first Catholic king of Jerusalem? Who became the first Catholic emperor of Constantinople?

Who became the first Catholic king of Jerusalem? Who became the first Catholic emperor of Constantinople? Who appointed or selected these people?

The first Catholic king of Jerusalem in 1099 and the first Catholic emperor of Constantinople in 1205 were relatives and namesakes – counts of Flanders named Baudouin. They were chosen by the leaders of the Crusaders after the victories over the Muslims.

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