premise: The Monument to Vasil Levski (Bulgarian: Паметник на Васил Левски , "Pametnik na Vasil Levski") in the centre of Sofia, the capital of Bulgaria, is one of the first monuments to be built in the then newly liberated Principality of Bulgaria. It commemorates the hanging of Bulgarian national hero and major revolutionary figure Vasil Levski on the same spot on 18 February 1873.
hypothesis: The Monument to Vasil Levski may or may not have been the first monument in the  Principality of Bulgaria.
reason: Used qualifying language.