Reference

The inscriptions on the plaques at Pavillon Sully have historical significance, reflecting key periods and figures associated with the Louvre. According to the source on Napoleon III's Louvre expansion, there are black marble plaques on either side of the Pavillon Sully with gilded inscriptions. These inscriptions denote important dates and the connection to figures such as Napoleon I. Specifically, they commemorate the year 1541 and Napoleon I's influence, presumably marking architectural or historical developments related to the Louvre's expansion during Napoleon III's era.

The Pavillon Sully, also known as the Pavillon de l'Horloge, is an integral part of the Louvre Palace, positioned as a central element in the museum's history and architectural evolution. The plaques likely serve to honor the legacy of these periods and persons in enhancing the cultural prominence of the Louvre.

For more detailed information, you can explore the content from the source Napoleon III's Louvre expansion - Wikipedia.

Here are some images of the Pavillon Sully: