|Lord of Berat, Valona and Kanina|
His father was Žarko, a leading nobleman in Zeta after Emperor Stefan Dušan's death, mentioned in June 1357 as Emperor Uroš's nobleman. Mrkša's mother was Teodora Dejanović, the daughter of Dejan, one of Stefan Dušan's magnates, and Teodora Nemanjić, Dušan's sister.
In 1391, Mrkša married Ruđina Balšić, the daughter of Balša II, a lord in Zeta, and Komnina Asen, daughter of Jovan Asen. As a dowry Balša II received Valona, Berat, Kanina, and Himarë in the south of Albania. After Balša II's death in the Battle of Savra, his wife Komnina ruled over his territory until 1396, when she became a nun and gave her territories to son-in-law Mrkša. Mrkša became a Lord of Berat, Valona and Kanina.
Mrkša was able to hold his territories until his death in October 1414. After his death his wife Ruđina tried to transfer Mrkša's possessions to the Republic of Venice in 1415 and 1416, but an agreement was never reached. So in 1417, the whole area was conquered by the Ottoman Empire.
- Marek, Miroslav. "The Balsici". genealogy.euweb.cz. Retrieved 2 October 2013.[self-published source][better source needed]
- "Chapter 3. — NOBLE FAMILIES in 14th CENTURY ZETA". fmg.ac. Retrieved 2 October 2013.
- Martha Ross 1978, p. 508.
- Group of authors (1994). Istorija srpskog naroda. 1371 (Drugo izd. ed.). Beograd: Srpska književna zadruga. ISBN 8637904769.
- Martha Ross (1978). Rulers and Governments of the World: Earliest Times to 1491. Bowker. ISBN 978-0-85935-021-1.