There are a number of population groups with a traditionally itinerant (travelling) lifestyle in Europe, also variously known as "travellers", or "gypsies". The oldest and most widely dispersed of these groups are the Romani people, ultimately of Indian origin, who entered Europe in the 14th to 15th century. There are various other traditionally itinerant groups in Europe who took up this lifestyle out of necessity at some point during the Early Modern period. Unlike the Romani, these are not separate ethnic groups but have formed as separate classes within the sedentary majority; they do not have an entirely separate language, but they developed specialized jargon (known as cant or argot).