Alena Mrnjavčević

Jevrosima (Јевросима), or Alena or Aljena (Алена or Аљена, Old Cyrillic: Алѣна), also known as Jelena "Lena" Mrnjavčević (Јелена "Лена" Мрњавчевић), was a wife of King Vukašin of Serbia.

In 1365, Alena became a consort of Serbia, since Vukašin was crowned as the co-ruler of Tsar Stefan Uroš V.

Vukašin and Alena's children:
 * Prince Marko
 * Andrijaš Mrnjavčević
 * Dmitar Mrnjavčević
 * Ivaniš Mrnjavčević
 * Olivera

As a widow, Alena went to the monastery.