Notre Dame’s medieval roof structure, known as "the forest," has been lost to the massive fire, according to Msgr. Patrick Chauvet, the rector of the cathedral.
“The framework from the 13th century is called a forest, because it required a forest of trees to build it,” he said.
The cathedral's wooden frame, which primarily consists of oak, contains beams that date as far back as the first frame. It features trees cut down between 1160 and 1170, forming one of the oldest parts of the structure.
Most of the current frame dates from the year 1220, according to the church's website.
According to the Notre Dame website, it’s one of Paris’s oldest frameworks. Learn more about the construction of the famous cathedral here.