Treatle was an eighth level wizard and the Vice Chancellor of Unseen University (a now vacant office) in Equal Rites. He was also a mage of the Ancient and Truly Original Brothers of the Silver Star. He was the epitome of wizardry, with long, bushy eyebrows, a nicotine-stained Patriarchal beard, spangly robes and curly-toed boots. He was the wizard who was responsible for bringing Simon to Unseen University, traveling with him.