An old serving-woman who lived and worked in the Emerië region of Númenor during the ninth century of the Second Age. Zamîn was strong-willed woman, ready to speak her mind, even to her mistress. She was familiar with the lands and people of Emerië, which suggests that she grew up in that pastoral land, or at least that she had worked there for many years.

In about the year II 858, King Tar-Meneldur built a White House in Emerië as a betrothal gift for Erendis, who was to wed his son Aldarion. Erendis and Aldarion were married twelve years later, but their marriage became troubled, and Erendis retreated from court to dwell in the White House. At this time Zamîn was an important figure in the household, and played a part in educating Ancalimë, the young daughter of her mistress.

Zamîn remained a faithful companion and confidante to Ancalimë as the girl grew. When her father changed the law to allow a daughter to inherit the throne, Ancalimë became the heir apparent, and many suitors sought her hand. To escape these unwanted suitors, the princess took on the role of a shepherdess, and hid herself on a farm in Emerië for a time, and Zamîn assisted with the ruse.

Eventually, Ancalimë accepted her role and became Tar-Ancalimë, the first Ruling Queen of Númenor, but we have no account of Zamîn's life beyond this point. It is perhaps possible that the faithful servant even joined the new Queen at court in Armenelos. Ancalimë, however, was two hundred and two years old when she took up the Sceptre and - long-lived as the Númenóreans were - it seems rather implausible that her former teacher and servant, who was already old when Ancalimë was a child, would still have been with her so late in her life.