The brand was introduced by Simon Marks in 1928, after his father and co-founder of Marks & Spencer, Michael Marks. By 1950, virtually all goods were sold under the St Michael brand. M&S lingerie, women's clothing and girls' uniform were branded under the St Margaret brand, until the whole range of general merchandise became St Michael.
In 2000, Marks & Spencer dropped the St Michael brand, and replacing it with the Marks & Spencer brand. The St Michael name was subsequently adopted as a 'quality guarantee' and appeared as the St Michael Quality Promise on the back of food products, on the side of delivery vehicles and on in-store ordering receipts.
The St Michael Quality Promise was phased out in 2000.