Belgian Abbey Beer Since 1240. Leffe is a leading speciality beer in the UK. Leffe is the result of a tradition that goes all the way back to 1240, when the monks of Notre-Dame de Leffe began brewing beer. Their craft, expertise and brewing tradition can still be enjoyed today. This brewing heritage is now shared and enjoyed by consumers in over 60 countries worldwide. Leffe has a range of beers across different styles, intensities and occasions. Our flagship beer is Leffe blonde, a smooth and fruity Belgian abbey style beer. Belgian Abbey Beer Since 1240.