In 1858, the French emperor Napoleon III successfully gained the possession, in the name of the French government, of Longwood House and the lands around it, last residence of Napoleon I (who died there in 1821). It is still French property, administered by a French representative and under the authority of the French Ministry of Foreign Affairs.

Answer this question, if possible (if impossible, reply "unanswerable"): Who has authority over Longwood house?
French Ministry of Foreign Affairs