Why are ivy league schools called “ivy league schools”? Thanks!!!?

The first usage of “Ivy League” recorded by the Oxford English Dictionary is from a sports-writer in 1933. Several sports-writers and other journalists of the era used it to refer to the older colleges, those along the northeastern seaboard of the United States, chiefly the nine institutions with origins dating from the colonial era, together with the United States Military Academy (West Point), the United States Naval Academy, and a few others. These schools were known for their long-standing traditions in intercollegiate athletics, often being the first schools to participate in such activities. However, at this time, none of these institutions would make efforts to form an athletic league.

Ivy covering West College, Princeton University

The Ivy League’s name derives from the ivy plants, symbolic of their age, that cover many of these institutions’ historic buildings. The Ivy League universities are also called the “Ancient Eight” or simply the Ivies.

A common folk etymology attributes the name to the Roman numerals for four (IV), asserting that there was such a sports league originally with four members. The Morris Dictionary of Word and Phrase Origins helped to perpetuate this belief. The supposed “IV League” was formed over a century ago and consisted of Harvard, Yale, Princeton, and a 4th school that varies depending on who is telling the story.

However, representatives from four schools, Rutgers, Princeton, Yale and Columbia met at the Fifth Avenue Hotel in Manhattan on 19 October 1873 to establish a set of rules governing their intercollegiate athletic competition, and particularly to codify the new game of college football (which at the time, largely resembled what is currently called soccer). Though invited, Harvard chose not to attend. While no formal organization or conference was established, the results of this meeting governed athletic events between these schools well into the twentieth century.

this is a part of article in Wikipedia about Ivy League…

it’s all here

I forgot who had come up with it ( a President, I think) but it classified about 5 major colleges at that time.