Diageo is still a relatively young company - we have only existed in our current form since 1997- but our brands and our business have a rich heritage. our earliest ancestor company formed in 1749, is Justerini & Brooks - wine merchants, and blenders of the famous J&B whisky range. 10 yea... read morers after that, in 1759 Arthur Guinness signed the lease on the now world famous St James's Gate brewery in Dublin, going on to create a globally iconic brand.