the right (and left) of it

It’s actually a bit more complicated than that may suggest, since originally the (tricoleur) flag was hung t’other way around with the red next to the staff in ‘left wing’ position, but is nowadays hung blue on the left!

The origin is normally credited to Lafayette around the time of the storming of the Bastille, and I think stems from the troop uniform col[e/o](u)rs of Paris with the addition of the white of the Bourbon monarchy.

Lemme see what I can quickly find…