The native name ''Crna Gora,'' also meaning "black mountain" or "black hill", was mentioned for the first time in a charter issued by Stefan Milutin. It came to denote the majority of contemporary Montenegro in the 15th century. Originally, it had referred to only a small strip of land under the rule of the Paštrovići tribe, but the name eventually came to be used for the wider mountainous region after the Crnojević noble family took power in Upper Zeta. The aforementioned region became known as ''Stara Crna Gora'' 'Old Montenegro' by the 19th century to distinguish the independent region from the neighbouring Ottoman-occupied Montenegrin territory of ''Brda'' '(The) Highlands'. Montenegro further increased its size several times by the 20th century, as the result of wars against the Ottoman Empire, which saw the annexation of Old Herzegovina and parts of Metohija and southern Raška. Its borders have changed little since then, losing Metohija and gaining the Bay of Kotor.