The Khalkha (Mongolian: Халх; Khalkh, Halh) is the largest subgroup of Mongol people in Mongolia since the 15th century. The Khalkha, together with Chahars, Ordos and Tumed, were directly ruled by Borjigin khans until the 20th century; unlike the Oirats, who were ruled by Dzungar nobles, or the Khorchins, who were ruled by Qasar's descendants.