Is this the first documented account of a Grey? If they’ve been around for so long, shouldn’t the earliest reports date back well before the 20th century? I’m really interested in learning about the very first or earliest known description of the Greys.

The concept of “Greys,” a common type of alien described in UFO lore, indeed has roots that stretch back before the 20th century, though their modern depiction became prominent after the 1950s. The earliest well-documented cases resembling descriptions of the Greys typically appear around the time of the alleged Roswell incident in 1947, where witnesses described beings that matched the Greys’ characteristics: small stature, large heads, and big black eyes.
However, accounts of encounters with beings that share similar features can be found in older folklore and mythology. For instance, various cultures have stories of supernatural beings or spirits that could resemble modern interpretations of Greys.
If you’re looking for a specific document, the 1947 Arnold sighting and subsequent reports in the years that followed, including the Kenneth Arnold sighting, helped define the image of these aliens in public consciousness. From those incidents, the depiction of Greys has since evolved and been popularized in media and literature.
If you want to explore older descriptions, you might consider looking into historical texts or folklore from different cultures, as they often describe beings like “fairies” or “elementals” that could tangentially align with the physical traits attributed to Greys.