I was once asked by a native French speaker if I’d like to visit the Musée Delacroix with her. She might have even been speaking English, but when she said <<De-la-croix>>, my brain did a Franglish translanguation into “of the cross”. I heard a space between the parts of the name. I didn’t make the leap to the artist Eugène Delacroix (1789-1863) until I was actually at his former home which is now a museum. The Musée Delacroix is tucked away on rue de Furstenberg and is yet another reason to hang out in the 6th arrondissement. You can scope it out after lunch at the Brasserie Lipp on your way to Rue de Buci.
The most recognizable Delacroix work to me is Liberty Leading the People (1830) because it was (used to be) on the French Franc paper money (100 FF). I was charmed by what I considered the very enlightened choice of putting artists and their works on paper money (instead of Presidents and Founding Fathers on US bank notes).
Here’s a googlemap image starting at Brasserie Lipp, to the Musée Delacroix ending at Rue de Buci. This st/roll is clocked at taking 6 minutes, but you might end up spending all day! BTW, the top of a church that is in the shape of a cross is the Église Saint-Germain-des-Prés, yet another treasure for you to enjoy.