Jelena Gruba

Helen , also known by the name Gruba , was queen of Bosnia, first as queen consort from 1391 until 1395 and then as queen regnant until 1398. Born probably into the Nikoli noble family, which ruled a part of Zachlumia, she was the widow and successor of King Dabia, a member of the House of Kotromani. She remains the only female head of state in the history of Bosnia and Herzegovina.

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Source: Wikipedia