In 1874 (150 years ago) (1874), 18 years after the beginning of modern Carnival celebrations in New Orleans, Rex chose to have a grand arrival in New Orleans from the Mississippi River. Once on dry land, Rex and his royal court were placed in carriages and driven through the streets to City Hall. Therein, the mayor and various city officials would present King with the keys to the city and proclaim the rule of Rex in this mystical and temporary realm of Carnival. Typically, the proclamation decreed the beginning of Mardi Gras and Rex's reign at sunrise the following morning.^{[citation needed]}

The Rex landing was a success, quickly becoming a treasured part of the Carnival celebrations which was unique to New Orleans, but no other country or parishes observed the Monday before Shrovetide. The landing continued until World War I stopped Carnival in New Orleans. When the parades again returned to the streets some two years later, the landing had fallen by the wayside, a seeming casualty of "the war to end war".^{[citation needed]}

In 1971, the landing was recreated for one time only to celebrate Rex's centennial. In 1987, Rex once again made a grand arrival on the Riverfront at the foot of Canal Street but now with the phrase Lundi Gras attached to the events which would include concerts and fireworks.

The King of the Zulu Social Aid & Pleasure Club also participates in the modern version of the event; the Mayor of New Orleans usually attends as well to salute the two Carnival monarchs and turn over symbolic control of the city for the following day.

The chronology of the term's usage in the common language of the New Orleans carnival is generally misunderstood. While there has been some earlier historic use of the term not confined to New Orleans, the current Lundi Gras, referring to a group of New Orleans riverfront activities, is a relatively new rather than an old carnival custom.

• Carnival
• Mardi Gras
• Shrove Monday
• Clean Monday
• Collop Monday
• Rosenmontag
• Nickanan Night