The names and attributes of the chief Valar, as they were known to the Elves in Valinor, are listed below. In Middle-earth, they were known by their Sindarin names: Varda, for example, was called Elbereth. Men knew them by many other names, and sometimes worshipped them as gods. With the exception of Oromë, the names listed below are not actual names but rather titles: the true names of the Valar are nowhere recorded. The males are called Lords of the Valar; the females Queens of the Valar, or Valier. Of the seven male and seven female Valar, there are six married pairs: Ulmo and Nienna are the only ones who dwell alone. This is evidently a form of spiritual union, as in Tolkien's later conception they do not reproduce in a manner reminiscent of the classical Greek gods.