The primary meaning of Doctor in English has historically been with reference to the holder of a doctoral degree. These particularly referred to the ancient faculties of divinity, law and medicine, sometimes with the addition of music, which were the only doctoral degrees offered until the 19th century. During the 19th century, PhDs became increasingly common in Britain, although to obtain the degree it was necessary to travel to continental Europe or (from 1861) to the United States, as the degree was not awarded in the UK until 1917.