The rise in distrust of Muggleborns came primarily after the passing of the International Statute of Secrecy in the 17th century, after which the magical community withdrew from larger interaction with the Muggle world. The isolation from the Muggle world largely fueled pureblood supremacy movements in later centuries.

During the first annual Gobstones competition held at Hogwarts in celebration of its first alumni, a Mudblood player from Gryffindor beat all the Slytherin students in a row.

Accussed by Salasar of cheating the student then challenged the emerald founder and beat him 15-0. It is said that 1000 year old residue of the putrid liquid spat from gobstones was found at the entrance to the chamber of secrets.