Like many other common law terms, the term originated in England in the Middle Ages, and the "call to the bar" refers to the summons issued to one found fit to speak at the "bar" of the royal courts. In time, English judges allowed only legally qualified men to address them on the law and later delegated the qualification and admission of barristers to the four Inns of Court. Once an Inn calls one of its members to its bar, they are thereafter a barrister. They may not, however, practise as a barrister until they have completed (or been exempted from) an apprenticeship called "pupillage". After completing pupillage, they are considered to be a practising barrister with a right of audience before all courts.